diff --git a/dist/js-yaml.js b/dist/js-yaml.js
index ee6530a9..228bdd24 100644
--- a/dist/js-yaml.js
+++ b/dist/js-yaml.js
@@ -1,5 +1,5 @@
 
-/*! js-yaml 3.14.0 https://github.com/nodeca/js-yaml @license MIT */
+/*! js-yaml 4.0.0 https://github.com/nodeca/js-yaml @license MIT */
 (function (global, factory) {
   typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
   typeof define === 'function' && define.amd ? define(['exports'], factory) :
@@ -74,6 +74,26 @@
 
   // YAML error class. http://stackoverflow.com/questions/8458984
 
+
+  function formatError(exception, compact) {
+    var where = '', message = exception.reason || '(unknown reason)';
+
+    if (!exception.mark) return message;
+
+    if (exception.mark.name) {
+      where += 'in "' + exception.mark.name + '" ';
+    }
+
+    where += '(' + (exception.mark.line + 1) + ':' + (exception.mark.column + 1) + ')';
+
+    if (!compact && exception.mark.snippet) {
+      where += '\n\n' + exception.mark.snippet;
+    }
+
+    return message + ' ' + where;
+  }
+
+
   function YAMLException(reason, mark) {
     // Super constructor
     Error.call(this);
@@ -81,7 +101,7 @@
     this.name = 'YAMLException';
     this.reason = reason;
     this.mark = mark;
-    this.message = (this.reason || '(unknown reason)') + (this.mark ? ' ' + this.mark.toString() : '');
+    this.message = formatError(this, false);
 
     // Include stack trace in error object
     if (Error.captureStackTrace) {
@@ -100,98 +120,117 @@
 
 
   YAMLException.prototype.toString = function toString(compact) {
-    var result = this.name + ': ';
+    return this.name + ': ' + formatError(this, compact);
+  };
 
-    result += this.reason || '(unknown reason)';
 
-    if (!compact && this.mark) {
-      result += ' ' + this.mark.toString();
-    }
+  var exception = YAMLException;
 
-    return result;
-  };
+  // get snippet for a single line, respecting maxLength
+  function getLine(buffer, lineStart, lineEnd, position, maxLineLength) {
+    var head = '';
+    var tail = '';
+    var maxHalfLength = Math.floor(maxLineLength / 2) - 1;
 
+    if (position - lineStart > maxHalfLength) {
+      head = ' ... ';
+      lineStart = position - maxHalfLength + head.length;
+    }
 
-  var exception = YAMLException;
+    if (lineEnd - position > maxHalfLength) {
+      tail = ' ...';
+      lineEnd = position + maxHalfLength - tail.length;
+    }
 
-  function Mark(name, buffer, position, line, column) {
-    this.name     = name;
-    this.buffer   = buffer;
-    this.position = position;
-    this.line     = line;
-    this.column   = column;
+    return {
+      str: head + buffer.slice(lineStart, lineEnd).replace(/\t/g, '→') + tail,
+      pos: position - lineStart + head.length // relative position
+    };
   }
 
 
-  Mark.prototype.getSnippet = function getSnippet(indent, maxLength) {
-    var head, start, tail, end, snippet;
+  function padStart(string, max) {
+    return common.repeat(' ', max - string.length) + string;
+  }
 
-    if (!this.buffer) return null;
 
-    indent = indent || 4;
-    maxLength = maxLength || 75;
+  function makeSnippet(mark, options) {
+    options = Object.create(options || null);
 
-    head = '';
-    start = this.position;
+    if (!mark.buffer) return null;
 
-    while (start > 0 && '\x00\r\n\x85\u2028\u2029'.indexOf(this.buffer.charAt(start - 1)) === -1) {
-      start -= 1;
-      if (this.position - start > (maxLength / 2 - 1)) {
-        head = ' ... ';
-        start += 5;
-        break;
-      }
-    }
+    if (!options.maxLength) options.maxLength = 79;
+    if (typeof options.indent      !== 'number') options.indent      = 1;
+    if (typeof options.linesBefore !== 'number') options.linesBefore = 3;
+    if (typeof options.linesAfter  !== 'number') options.linesAfter  = 2;
 
-    tail = '';
-    end = this.position;
+    var re = /\r?\n|\r|\0/g;
+    var lineStarts = [ 0 ];
+    var lineEnds = [];
+    var match;
+    var foundLineNo = -1;
 
-    while (end < this.buffer.length && '\x00\r\n\x85\u2028\u2029'.indexOf(this.buffer.charAt(end)) === -1) {
-      end += 1;
-      if (end - this.position > (maxLength / 2 - 1)) {
-        tail = ' ... ';
-        end -= 5;
-        break;
+    while ((match = re.exec(mark.buffer))) {
+      lineEnds.push(match.index);
+      lineStarts.push(match.index + match[0].length);
+
+      if (mark.position <= match.index && foundLineNo < 0) {
+        foundLineNo = lineStarts.length - 2;
       }
     }
 
-    snippet = this.buffer.slice(start, end);
-
-    return common.repeat(' ', indent) + head + snippet + tail + '\n' +
-           common.repeat(' ', indent + this.position - start + head.length) + '^';
-  };
-
+    if (foundLineNo < 0) foundLineNo = lineStarts.length - 1;
 
-  Mark.prototype.toString = function toString(compact) {
-    var snippet, where = '';
+    var result = '', i, line;
+    var lineNoLength = Math.min(mark.line + options.linesAfter, lineEnds.length).toString().length;
+    var maxLineLength = options.maxLength - (options.indent + lineNoLength + 3);
 
-    if (this.name) {
-      where += 'in "' + this.name + '" ';
+    for (i = 1; i <= options.linesBefore; i++) {
+      if (foundLineNo - i < 0) break;
+      line = getLine(
+        mark.buffer,
+        lineStarts[foundLineNo - i],
+        lineEnds[foundLineNo - i],
+        mark.position - (lineStarts[foundLineNo] - lineStarts[foundLineNo - i]),
+        maxLineLength
+      );
+      result = common.repeat(' ', options.indent) + padStart((mark.line - i + 1).toString(), lineNoLength) +
+        ' | ' + line.str + '\n' + result;
     }
 
-    where += 'at line ' + (this.line + 1) + ', column ' + (this.column + 1);
+    line = getLine(mark.buffer, lineStarts[foundLineNo], lineEnds[foundLineNo], mark.position, maxLineLength);
+    result += common.repeat(' ', options.indent) + padStart((mark.line + 1).toString(), lineNoLength) +
+      ' | ' + line.str + '\n';
+    result += common.repeat('-', options.indent + lineNoLength + 3 + line.pos) + '^' + '\n';
 
-    if (!compact) {
-      snippet = this.getSnippet();
-
-      if (snippet) {
-        where += ':\n' + snippet;
-      }
+    for (i = 1; i <= options.linesAfter; i++) {
+      if (foundLineNo + i >= lineEnds.length) break;
+      line = getLine(
+        mark.buffer,
+        lineStarts[foundLineNo + i],
+        lineEnds[foundLineNo + i],
+        mark.position - (lineStarts[foundLineNo] - lineStarts[foundLineNo + i]),
+        maxLineLength
+      );
+      result += common.repeat(' ', options.indent) + padStart((mark.line + i + 1).toString(), lineNoLength) +
+        ' | ' + line.str + '\n';
     }
 
-    return where;
-  };
+    return result.replace(/\n$/, '');
+  }
 
 
-  var mark = Mark;
+  var snippet = makeSnippet;
 
   var TYPE_CONSTRUCTOR_OPTIONS = [
     'kind',
+    'multi',
     'resolve',
     'construct',
     'instanceOf',
     'predicate',
     'represent',
+    'representName',
     'defaultStyle',
     'styleAliases'
   ];
@@ -226,15 +265,17 @@
     });
 
     // TODO: Add tag format check.
-    this.tag          = tag;
-    this.kind         = options['kind']         || null;
-    this.resolve      = options['resolve']      || function () { return true; };
-    this.construct    = options['construct']    || function (data) { return data; };
-    this.instanceOf   = options['instanceOf']   || null;
-    this.predicate    = options['predicate']    || null;
-    this.represent    = options['represent']    || null;
-    this.defaultStyle = options['defaultStyle'] || null;
-    this.styleAliases = compileStyleAliases(options['styleAliases'] || null);
+    this.tag           = tag;
+    this.kind          = options['kind']          || null;
+    this.resolve       = options['resolve']       || function () { return true; };
+    this.construct     = options['construct']     || function (data) { return data; };
+    this.instanceOf    = options['instanceOf']    || null;
+    this.predicate     = options['predicate']     || null;
+    this.represent     = options['represent']     || null;
+    this.representName = options['representName'] || null;
+    this.defaultStyle  = options['defaultStyle']  || null;
+    this.multi         = options['multi']         || false;
+    this.styleAliases  = compileStyleAliases(options['styleAliases'] || null);
 
     if (YAML_NODE_KINDS.indexOf(this.kind) === -1) {
       throw new exception('Unknown kind "' + this.kind + '" is specified for "' + tag + '" YAML type.');
@@ -254,7 +295,10 @@
 
     schema[name].forEach(function (currentType) {
       result.forEach(function (previousType, previousIndex) {
-        if (previousType.tag === currentType.tag && previousType.kind === currentType.kind) {
+        if (previousType.tag === currentType.tag &&
+            previousType.kind === currentType.kind &&
+            previousType.multi === currentType.multi) {
+
           exclude.push(previousIndex);
         }
       });
@@ -273,11 +317,22 @@
           scalar: {},
           sequence: {},
           mapping: {},
-          fallback: {}
+          fallback: {},
+          multi: {
+            scalar: [],
+            sequence: [],
+            mapping: [],
+            fallback: []
+          }
         }, index, length;
 
     function collectType(type) {
-      result[type.kind][type.tag] = result['fallback'][type.tag] = type;
+      if (type.multi) {
+        result.multi[type.kind].push(type);
+        result.multi['fallback'].push(type);
+      } else {
+        result[type.kind][type.tag] = result['fallback'][type.tag] = type;
+      }
     }
 
     for (index = 0, length = arguments.length; index < length; index += 1) {
@@ -322,6 +377,10 @@
       if (type$1.loadKind && type$1.loadKind !== 'scalar') {
         throw new exception('There is a non-scalar type in the implicit list of a schema. Implicit resolving of such types is not supported.');
       }
+
+      if (type$1.multi) {
+        throw new exception('There is a multi type in the implicit list of a schema. Multi tags can only be listed as explicit.');
+      }
     });
 
     explicit.forEach(function (type$1) {
@@ -394,7 +453,8 @@
       canonical: function () { return '~';    },
       lowercase: function () { return 'null'; },
       uppercase: function () { return 'NULL'; },
-      camelcase: function () { return 'Null'; }
+      camelcase: function () { return 'Null'; },
+      empty:     function () { return '';     }
     },
     defaultStyle: 'lowercase'
   });
@@ -496,17 +556,22 @@
         return hasDigits && ch !== '_';
       }
 
-      // base 8
-      for (; index < max; index++) {
-        ch = data[index];
-        if (ch === '_') continue;
-        if (!isOctCode(data.charCodeAt(index))) return false;
-        hasDigits = true;
+
+      if (ch === 'o') {
+        // base 8
+        index++;
+
+        for (; index < max; index++) {
+          ch = data[index];
+          if (ch === '_') continue;
+          if (!isOctCode(data.charCodeAt(index))) return false;
+          hasDigits = true;
+        }
+        return hasDigits && ch !== '_';
       }
-      return hasDigits && ch !== '_';
     }
 
-    // base 10 (except 0) or base 60
+    // base 10 (except 0)
 
     // value should not start with `_`;
     if (ch === '_') return false;
@@ -514,7 +579,6 @@
     for (; index < max; index++) {
       ch = data[index];
       if (ch === '_') continue;
-      if (ch === ':') break;
       if (!isDecCode(data.charCodeAt(index))) {
         return false;
       }
@@ -524,15 +588,11 @@
     // Should have digits and should not end with `_`
     if (!hasDigits || ch === '_') return false;
 
-    // if !base60 - done;
-    if (ch !== ':') return true;
-
-    // base60 almost not used, no needs to optimize
-    return /^(:[0-5]?[0-9])+$/.test(data.slice(index));
+    return true;
   }
 
   function constructYamlInteger(data) {
-    var value = data, sign = 1, ch, base, digits = [];
+    var value = data, sign = 1, ch;
 
     if (value.indexOf('_') !== -1) {
       value = value.replace(/_/g, '');
@@ -550,25 +610,8 @@
 
     if (ch === '0') {
       if (value[1] === 'b') return sign * parseInt(value.slice(2), 2);
-      if (value[1] === 'x') return sign * parseInt(value, 16);
-      return sign * parseInt(value, 8);
-    }
-
-    if (value.indexOf(':') !== -1) {
-      value.split(':').forEach(function (v) {
-        digits.unshift(parseInt(v, 10));
-      });
-
-      value = 0;
-      base = 1;
-
-      digits.forEach(function (d) {
-        value += (d * base);
-        base *= 60;
-      });
-
-      return sign * value;
-
+      if (value[1] === 'x') return sign * parseInt(value.slice(2), 16);
+      if (value[1] === 'o') return sign * parseInt(value.slice(2), 8);
     }
 
     return sign * parseInt(value, 10);
@@ -586,7 +629,7 @@
     predicate: isInteger,
     represent: {
       binary:      function (obj) { return obj >= 0 ? '0b' + obj.toString(2) : '-0b' + obj.toString(2).slice(1); },
-      octal:       function (obj) { return obj >= 0 ? '0'  + obj.toString(8) : '-0'  + obj.toString(8).slice(1); },
+      octal:       function (obj) { return obj >= 0 ? '0o'  + obj.toString(8) : '-0o'  + obj.toString(8).slice(1); },
       decimal:     function (obj) { return obj.toString(10); },
       /* eslint-disable max-len */
       hexadecimal: function (obj) { return obj >= 0 ? '0x' + obj.toString(16).toUpperCase() :  '-0x' + obj.toString(16).toUpperCase().slice(1); }
@@ -602,12 +645,10 @@
 
   var YAML_FLOAT_PATTERN = new RegExp(
     // 2.5e4, 2.5 and integers
-    '^(?:[-+]?(?:0|[1-9][0-9_]*)(?:\\.[0-9_]*)?(?:[eE][-+]?[0-9]+)?' +
+    '^(?:[-+]?(?:[0-9][0-9_]*)(?:\\.[0-9_]*)?(?:[eE][-+]?[0-9]+)?' +
     // .2e4, .2
     // special case, seems not from spec
     '|\\.[0-9_]+(?:[eE][-+]?[0-9]+)?' +
-    // 20:59
-    '|[-+]?[0-9][0-9_]*(?::[0-5]?[0-9])+\\.[0-9_]*' +
     // .inf
     '|[-+]?\\.(?:inf|Inf|INF)' +
     // .nan
@@ -627,11 +668,10 @@
   }
 
   function constructYamlFloat(data) {
-    var value, sign, base, digits;
+    var value, sign;
 
     value  = data.replace(/_/g, '').toLowerCase();
     sign   = value[0] === '-' ? -1 : 1;
-    digits = [];
 
     if ('+-'.indexOf(value[0]) >= 0) {
       value = value.slice(1);
@@ -642,22 +682,6 @@
 
     } else if (value === '.nan') {
       return NaN;
-
-    } else if (value.indexOf(':') >= 0) {
-      value.split(':').forEach(function (v) {
-        digits.unshift(parseFloat(v, 10));
-      });
-
-      value = 0.0;
-      base = 1;
-
-      digits.forEach(function (d) {
-        value += d * base;
-        base *= 60;
-      });
-
-      return sign * value;
-
     }
     return sign * parseFloat(value, 10);
   }
@@ -817,19 +841,8 @@
     resolve: resolveYamlMerge
   });
 
-  function commonjsRequire (target) {
-  	throw new Error('Could not dynamically require "' + target + '". Please configure the dynamicRequireTargets option of @rollup/plugin-commonjs appropriately for this require call to behave properly.');
-  }
-
   /*eslint-disable no-bitwise*/
 
-  var NodeBuffer;
-
-  try {
-    // A trick for browserified version, to not include `Buffer` shim
-    var _require = commonjsRequire;
-    NodeBuffer = _require('buffer').Buffer;
-  } catch (__) {}
 
 
 
@@ -895,13 +908,7 @@
       result.push((bits >> 4) & 0xFF);
     }
 
-    // Wrap into Buffer for NodeJS and leave Array for browser
-    if (NodeBuffer) {
-      // Support node 6.+ Buffer API when available
-      return NodeBuffer.from ? NodeBuffer.from(result) : new NodeBuffer(result);
-    }
-
-    return result;
+    return new Uint8Array(result);
   }
 
   function representYamlBinary(object /*, style*/) {
@@ -946,8 +953,8 @@
     return result;
   }
 
-  function isBinary(object) {
-    return NodeBuffer && NodeBuffer.isBuffer(object);
+  function isBinary(obj) {
+    return Object.prototype.toString.call(obj) ===  '[object Uint8Array]';
   }
 
   var binary = new type('tag:yaml.org,2002:binary', {
@@ -1222,7 +1229,10 @@
     this.filename  = options['filename']  || null;
     this.schema    = options['schema']    || _default;
     this.onWarning = options['onWarning'] || null;
+    // (Hidden) Remove? makes the loader to expect YAML 1.1 documents
+    // if such documents have no explicit %YAML directive
     this.legacy    = options['legacy']    || false;
+
     this.json      = options['json']      || false;
     this.listener  = options['listener']  || null;
 
@@ -1235,6 +1245,10 @@
     this.lineStart  = 0;
     this.lineIndent = 0;
 
+    // position of first leading tab in the current line,
+    // used to make sure there are no tabs in the indentation
+    this.firstTabInLine = -1;
+
     this.documents = [];
 
     /*
@@ -1251,9 +1265,17 @@
 
 
   function generateError(state, message) {
-    return new exception(
-      message,
-      new mark(state.filename, state.input, state.position, state.line, (state.position - state.lineStart)));
+    var mark = {
+      name:     state.filename,
+      buffer:   state.input.slice(0, -1), // omit trailing \0
+      position: state.position,
+      line:     state.line,
+      column:   state.position - state.lineStart
+    };
+
+    mark.snippet = snippet(mark);
+
+    return new exception(message, mark);
   }
 
   function throwError(state, message) {
@@ -1325,6 +1347,12 @@
         throwError(state, 'ill-formed tag prefix (second argument) of the TAG directive');
       }
 
+      try {
+        prefix = decodeURIComponent(prefix);
+      } catch (err) {
+        throwError(state, 'tag prefix is malformed: ' + prefix);
+      }
+
       state.tagMap[handle] = prefix;
     }
   };
@@ -1371,7 +1399,9 @@
     }
   }
 
-  function storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode, startLine, startPos) {
+  function storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode,
+    startLine, startLineStart, startPos) {
+
     var index, quantity;
 
     // The output is a plain object here, so keys can only be strings.
@@ -1418,10 +1448,22 @@
           !_hasOwnProperty$2.call(overridableKeys, keyNode) &&
           _hasOwnProperty$2.call(_result, keyNode)) {
         state.line = startLine || state.line;
+        state.lineStart = startLineStart || state.lineStart;
         state.position = startPos || state.position;
         throwError(state, 'duplicated mapping key');
       }
-      _result[keyNode] = valueNode;
+
+      // used for this specific key only because Object.defineProperty is slow
+      if (keyNode === '__proto__') {
+        Object.defineProperty(_result, keyNode, {
+          configurable: true,
+          enumerable: true,
+          writable: true,
+          value: valueNode
+        });
+      } else {
+        _result[keyNode] = valueNode;
+      }
       delete overridableKeys[keyNode];
     }
 
@@ -1446,6 +1488,7 @@
 
     state.line += 1;
     state.lineStart = state.position;
+    state.firstTabInLine = -1;
   }
 
   function skipSeparationSpace(state, allowComments, checkIndent) {
@@ -1454,6 +1497,9 @@
 
     while (ch !== 0) {
       while (is_WHITE_SPACE(ch)) {
+        if (ch === 0x09/* Tab */ && state.firstTabInLine === -1) {
+          state.firstTabInLine = state.position;
+        }
         ch = state.input.charCodeAt(++state.position);
       }
 
@@ -1755,6 +1801,8 @@
   function readFlowCollection(state, nodeIndent) {
     var readNext = true,
         _line,
+        _lineStart,
+        _pos,
         _tag     = state.tag,
         _result,
         _anchor  = state.anchor,
@@ -1763,7 +1811,7 @@
         isPair,
         isExplicitPair,
         isMapping,
-        overridableKeys = {},
+        overridableKeys = Object.create(null),
         keyNode,
         keyTag,
         valueNode,
@@ -1803,6 +1851,9 @@
         return true;
       } else if (!readNext) {
         throwError(state, 'missed comma between flow collection entries');
+      } else if (ch === 0x2C/* , */) {
+        // "flow collection entries can never be completely empty", as per YAML 1.2, section 7.4
+        throwError(state, "expected the node content, but found ','");
       }
 
       keyTag = keyNode = valueNode = null;
@@ -1818,7 +1869,9 @@
         }
       }
 
-      _line = state.line;
+      _line = state.line; // Save the current line.
+      _lineStart = state.lineStart;
+      _pos = state.position;
       composeNode(state, nodeIndent, CONTEXT_FLOW_IN, false, true);
       keyTag = state.tag;
       keyNode = state.result;
@@ -1835,9 +1888,9 @@
       }
 
       if (isMapping) {
-        storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode);
+        storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode, _line, _lineStart, _pos);
       } else if (isPair) {
-        _result.push(storeMappingPair(state, null, overridableKeys, keyTag, keyNode, valueNode));
+        _result.push(storeMappingPair(state, null, overridableKeys, keyTag, keyNode, valueNode, _line, _lineStart, _pos));
       } else {
         _result.push(keyNode);
       }
@@ -2009,6 +2062,10 @@
         detected  = false,
         ch;
 
+    // there is a leading tab before this token, so it can't be a block sequence/mapping;
+    // it can still be flow sequence/mapping or a scalar
+    if (state.firstTabInLine !== -1) return false;
+
     if (state.anchor !== null) {
       state.anchorMap[state.anchor] = _result;
     }
@@ -2016,6 +2073,10 @@
     ch = state.input.charCodeAt(state.position);
 
     while (ch !== 0) {
+      if (state.firstTabInLine !== -1) {
+        state.position = state.firstTabInLine;
+        throwError(state, 'tab characters must not be used in indentation');
+      }
 
       if (ch !== 0x2D/* - */) {
         break;
@@ -2066,11 +2127,13 @@
     var following,
         allowCompact,
         _line,
-        _pos,
+        _keyLine,
+        _keyLineStart,
+        _keyPos,
         _tag          = state.tag,
         _anchor       = state.anchor,
         _result       = {},
-        overridableKeys = {},
+        overridableKeys = Object.create(null),
         keyTag        = null,
         keyNode       = null,
         valueNode     = null,
@@ -2078,6 +2141,10 @@
         detected      = false,
         ch;
 
+    // there is a leading tab before this token, so it can't be a block sequence/mapping;
+    // it can still be flow sequence/mapping or a scalar
+    if (state.firstTabInLine !== -1) return false;
+
     if (state.anchor !== null) {
       state.anchorMap[state.anchor] = _result;
     }
@@ -2085,9 +2152,13 @@
     ch = state.input.charCodeAt(state.position);
 
     while (ch !== 0) {
+      if (!atExplicitKey && state.firstTabInLine !== -1) {
+        state.position = state.firstTabInLine;
+        throwError(state, 'tab characters must not be used in indentation');
+      }
+
       following = state.input.charCodeAt(state.position + 1);
       _line = state.line; // Save the current line.
-      _pos = state.position;
 
       //
       // Explicit notation case. There are two separate blocks:
@@ -2097,7 +2168,7 @@
 
         if (ch === 0x3F/* ? */) {
           if (atExplicitKey) {
-            storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null);
+            storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null, _keyLine, _keyLineStart, _keyPos);
             keyTag = keyNode = valueNode = null;
           }
 
@@ -2120,7 +2191,16 @@
       //
       // Implicit notation case. Flow-style node as the key first, then ":", and the value.
       //
-      } else if (composeNode(state, flowIndent, CONTEXT_FLOW_OUT, false, true)) {
+      } else {
+        _keyLine = state.line;
+        _keyLineStart = state.lineStart;
+        _keyPos = state.position;
+
+        if (!composeNode(state, flowIndent, CONTEXT_FLOW_OUT, false, true)) {
+          // Neither implicit nor explicit notation.
+          // Reading is done. Go to the epilogue.
+          break;
+        }
 
         if (state.line === _line) {
           ch = state.input.charCodeAt(state.position);
@@ -2137,7 +2217,7 @@
             }
 
             if (atExplicitKey) {
-              storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null);
+              storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null, _keyLine, _keyLineStart, _keyPos);
               keyTag = keyNode = valueNode = null;
             }
 
@@ -2164,15 +2244,18 @@
           state.anchor = _anchor;
           return true; // Keep the result of `composeNode`.
         }
-
-      } else {
-        break; // Reading is done. Go to the epilogue.
       }
 
       //
       // Common reading code for both explicit and implicit notations.
       //
       if (state.line === _line || state.lineIndent > nodeIndent) {
+        if (atExplicitKey) {
+          _keyLine = state.line;
+          _keyLineStart = state.lineStart;
+          _keyPos = state.position;
+        }
+
         if (composeNode(state, nodeIndent, CONTEXT_BLOCK_OUT, true, allowCompact)) {
           if (atExplicitKey) {
             keyNode = state.result;
@@ -2182,7 +2265,7 @@
         }
 
         if (!atExplicitKey) {
-          storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode, _line, _pos);
+          storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode, _keyLine, _keyLineStart, _keyPos);
           keyTag = keyNode = valueNode = null;
         }
 
@@ -2190,7 +2273,7 @@
         ch = state.input.charCodeAt(state.position);
       }
 
-      if (state.lineIndent > nodeIndent && (ch !== 0)) {
+      if ((state.line === _line || state.lineIndent > nodeIndent) && (ch !== 0)) {
         throwError(state, 'bad indentation of a mapping entry');
       } else if (state.lineIndent < nodeIndent) {
         break;
@@ -2203,7 +2286,7 @@
 
     // Special case: last mapping's node contains only the key in explicit notation.
     if (atExplicitKey) {
-      storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null);
+      storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null, _keyLine, _keyLineStart, _keyPos);
     }
 
     // Expose the resulting mapping.
@@ -2292,6 +2375,12 @@
       throwError(state, 'tag name cannot contain such characters: ' + tagName);
     }
 
+    try {
+      tagName = decodeURIComponent(tagName);
+    } catch (err) {
+      throwError(state, 'tag name is malformed: ' + tagName);
+    }
+
     if (isVerbatim) {
       state.tag = tagName;
 
@@ -2359,7 +2448,7 @@
 
     alias = state.input.slice(_position, state.position);
 
-    if (!state.anchorMap.hasOwnProperty(alias)) {
+    if (!_hasOwnProperty$2.call(state.anchorMap, alias)) {
       throwError(state, 'unidentified alias "' + alias + '"');
     }
 
@@ -2377,6 +2466,7 @@
         hasContent = false,
         typeIndex,
         typeQuantity,
+        typeList,
         type,
         flowIndent,
         blockIndent;
@@ -2478,48 +2568,66 @@
       }
     }
 
-    if (state.tag !== null && state.tag !== '!') {
-      if (state.tag === '?') {
-        // Implicit resolving is not allowed for non-scalar types, and '?'
-        // non-specific tag is only automatically assigned to plain scalars.
-        //
-        // We only need to check kind conformity in case user explicitly assigns '?'
-        // tag, for example like this: "!<?> [0]"
-        //
-        if (state.result !== null && state.kind !== 'scalar') {
-          throwError(state, 'unacceptable node kind for !<?> tag; it should be "scalar", not "' + state.kind + '"');
-        }
-
-        for (typeIndex = 0, typeQuantity = state.implicitTypes.length; typeIndex < typeQuantity; typeIndex += 1) {
-          type = state.implicitTypes[typeIndex];
+    if (state.tag === null) {
+      if (state.anchor !== null) {
+        state.anchorMap[state.anchor] = state.result;
+      }
 
-          if (type.resolve(state.result)) { // `state.result` updated in resolver if matched
-            state.result = type.construct(state.result);
-            state.tag = type.tag;
-            if (state.anchor !== null) {
-              state.anchorMap[state.anchor] = state.result;
-            }
-            break;
-          }
-        }
-      } else if (_hasOwnProperty$2.call(state.typeMap[state.kind || 'fallback'], state.tag)) {
-        type = state.typeMap[state.kind || 'fallback'][state.tag];
+    } else if (state.tag === '?') {
+      // Implicit resolving is not allowed for non-scalar types, and '?'
+      // non-specific tag is only automatically assigned to plain scalars.
+      //
+      // We only need to check kind conformity in case user explicitly assigns '?'
+      // tag, for example like this: "!<?> [0]"
+      //
+      if (state.result !== null && state.kind !== 'scalar') {
+        throwError(state, 'unacceptable node kind for !<?> tag; it should be "scalar", not "' + state.kind + '"');
+      }
 
-        if (state.result !== null && type.kind !== state.kind) {
-          throwError(state, 'unacceptable node kind for !<' + state.tag + '> tag; it should be "' + type.kind + '", not "' + state.kind + '"');
-        }
+      for (typeIndex = 0, typeQuantity = state.implicitTypes.length; typeIndex < typeQuantity; typeIndex += 1) {
+        type = state.implicitTypes[typeIndex];
 
-        if (!type.resolve(state.result)) { // `state.result` updated in resolver if matched
-          throwError(state, 'cannot resolve a node with !<' + state.tag + '> explicit tag');
-        } else {
+        if (type.resolve(state.result)) { // `state.result` updated in resolver if matched
           state.result = type.construct(state.result);
+          state.tag = type.tag;
           if (state.anchor !== null) {
             state.anchorMap[state.anchor] = state.result;
           }
+          break;
         }
+      }
+    } else if (state.tag !== '!') {
+      if (_hasOwnProperty$2.call(state.typeMap[state.kind || 'fallback'], state.tag)) {
+        type = state.typeMap[state.kind || 'fallback'][state.tag];
       } else {
+        // looking for multi type
+        type = null;
+        typeList = state.typeMap.multi[state.kind || 'fallback'];
+
+        for (typeIndex = 0, typeQuantity = typeList.length; typeIndex < typeQuantity; typeIndex += 1) {
+          if (state.tag.slice(0, typeList[typeIndex].tag.length) === typeList[typeIndex].tag) {
+            type = typeList[typeIndex];
+            break;
+          }
+        }
+      }
+
+      if (!type) {
         throwError(state, 'unknown tag !<' + state.tag + '>');
       }
+
+      if (state.result !== null && type.kind !== state.kind) {
+        throwError(state, 'unacceptable node kind for !<' + state.tag + '> tag; it should be "' + type.kind + '", not "' + state.kind + '"');
+      }
+
+      if (!type.resolve(state.result, state.tag)) { // `state.result` updated in resolver if matched
+        throwError(state, 'cannot resolve a node with !<' + state.tag + '> explicit tag');
+      } else {
+        state.result = type.construct(state.result, state.tag);
+        if (state.anchor !== null) {
+          state.anchorMap[state.anchor] = state.result;
+        }
+      }
     }
 
     if (state.listener !== null) {
@@ -2538,8 +2646,8 @@
 
     state.version = null;
     state.checkLineBreaks = state.legacy;
-    state.tagMap = {};
-    state.anchorMap = {};
+    state.tagMap = Object.create(null);
+    state.anchorMap = Object.create(null);
 
     while ((ch = state.input.charCodeAt(state.position)) !== 0) {
       skipSeparationSpace(state, true, -1);
@@ -2727,6 +2835,7 @@
   var _toString$2       = Object.prototype.toString;
   var _hasOwnProperty$3 = Object.prototype.hasOwnProperty;
 
+  var CHAR_BOM                  = 0xFEFF;
   var CHAR_TAB                  = 0x09; /* Tab */
   var CHAR_LINE_FEED            = 0x0A; /* LF */
   var CHAR_CARRIAGE_RETURN      = 0x0D; /* CR */
@@ -2775,6 +2884,8 @@
     'n', 'N', 'no', 'No', 'NO', 'off', 'Off', 'OFF'
   ];
 
+  var DEPRECATED_BASE60_SYNTAX = /^[-+]?[0-9_]+(?::[0-9_]+)+(?:\.[0-9_]*)?$/;
+
   function compileStyleMap(schema, map) {
     var result, keys, index, length, tag, style, type;
 
@@ -2823,6 +2934,10 @@
     return '\\' + handle + common.repeat('0', length - string.length) + string;
   }
 
+
+  var QUOTING_TYPE_SINGLE = 1,
+      QUOTING_TYPE_DOUBLE = 2;
+
   function State$1(options) {
     this.schema        = options['schema'] || _default;
     this.indent        = Math.max(1, (options['indent'] || 2));
@@ -2835,6 +2950,9 @@
     this.noRefs        = options['noRefs'] || false;
     this.noCompatMode  = options['noCompatMode'] || false;
     this.condenseFlow  = options['condenseFlow'] || false;
+    this.quotingType   = options['quotingType'] === '"' ? QUOTING_TYPE_DOUBLE : QUOTING_TYPE_SINGLE;
+    this.forceQuotes   = options['forceQuotes'] || false;
+    this.replacer      = typeof options['replacer'] === 'function' ? options['replacer'] : null;
 
     this.implicitTypes = this.schema.compiledImplicit;
     this.explicitTypes = this.schema.compiledExplicit;
@@ -2903,47 +3021,60 @@
   function isPrintable(c) {
     return  (0x00020 <= c && c <= 0x00007E)
         || ((0x000A1 <= c && c <= 0x00D7FF) && c !== 0x2028 && c !== 0x2029)
-        || ((0x0E000 <= c && c <= 0x00FFFD) && c !== 0xFEFF /* BOM */)
+        || ((0x0E000 <= c && c <= 0x00FFFD) && c !== CHAR_BOM)
         ||  (0x10000 <= c && c <= 0x10FFFF);
   }
 
   // [34] ns-char ::= nb-char - s-white
   // [27] nb-char ::= c-printable - b-char - c-byte-order-mark
   // [26] b-char  ::= b-line-feed | b-carriage-return
-  // [24] b-line-feed       ::=     #xA    /* LF */
-  // [25] b-carriage-return ::=     #xD    /* CR */
-  // [3]  c-byte-order-mark ::=     #xFEFF
-  function isNsChar(c) {
-    return isPrintable(c) && !isWhitespace(c)
-      // byte-order-mark
-      && c !== 0xFEFF
-      // b-char
+  // Including s-white (for some reason, examples doesn't match specs in this aspect)
+  // ns-char ::= c-printable - b-line-feed - b-carriage-return - c-byte-order-mark
+  function isNsCharOrWhitespace(c) {
+    return isPrintable(c)
+      && c !== CHAR_BOM
+      // - b-char
       && c !== CHAR_CARRIAGE_RETURN
       && c !== CHAR_LINE_FEED;
   }
 
-  // Simplified test for values allowed after the first character in plain style.
-  function isPlainSafe(c, prev) {
-    // Uses a subset of nb-char - c-flow-indicator - ":" - "#"
-    // where nb-char ::= c-printable - b-char - c-byte-order-mark.
-    return isPrintable(c) && c !== 0xFEFF
-      // - c-flow-indicator
-      && c !== CHAR_COMMA
-      && c !== CHAR_LEFT_SQUARE_BRACKET
-      && c !== CHAR_RIGHT_SQUARE_BRACKET
-      && c !== CHAR_LEFT_CURLY_BRACKET
-      && c !== CHAR_RIGHT_CURLY_BRACKET
-      // - ":" - "#"
-      // /* An ns-char preceding */ "#"
-      && c !== CHAR_COLON
-      && ((c !== CHAR_SHARP) || (prev && isNsChar(prev)));
+  // [127]  ns-plain-safe(c) ::= c = flow-out  ⇒ ns-plain-safe-out
+  //                             c = flow-in   ⇒ ns-plain-safe-in
+  //                             c = block-key ⇒ ns-plain-safe-out
+  //                             c = flow-key  ⇒ ns-plain-safe-in
+  // [128] ns-plain-safe-out ::= ns-char
+  // [129]  ns-plain-safe-in ::= ns-char - c-flow-indicator
+  // [130]  ns-plain-char(c) ::=  ( ns-plain-safe(c) - “:” - “#” )
+  //                            | ( /* An ns-char preceding */ “#” )
+  //                            | ( “:” /* Followed by an ns-plain-safe(c) */ )
+  function isPlainSafe(c, prev, inblock) {
+    var cIsNsCharOrWhitespace = isNsCharOrWhitespace(c);
+    var cIsNsChar = cIsNsCharOrWhitespace && !isWhitespace(c);
+    return (
+      // ns-plain-safe
+      inblock ? // c = flow-in
+        cIsNsCharOrWhitespace
+        : cIsNsCharOrWhitespace
+          // - c-flow-indicator
+          && c !== CHAR_COMMA
+          && c !== CHAR_LEFT_SQUARE_BRACKET
+          && c !== CHAR_RIGHT_SQUARE_BRACKET
+          && c !== CHAR_LEFT_CURLY_BRACKET
+          && c !== CHAR_RIGHT_CURLY_BRACKET
+    )
+      // ns-plain-char
+      && c !== CHAR_SHARP // false on '#'
+      && !(prev === CHAR_COLON && !cIsNsChar) // false on ': '
+      || (isNsCharOrWhitespace(prev) && !isWhitespace(prev) && c === CHAR_SHARP) // change to true on '[^ ]#'
+      || (prev === CHAR_COLON && cIsNsChar); // change to true on ':[^ ]'
   }
 
   // Simplified test for values allowed as the first character in plain style.
   function isPlainSafeFirst(c) {
     // Uses a subset of ns-char - c-indicator
     // where ns-char = nb-char - s-white.
-    return isPrintable(c) && c !== 0xFEFF
+    // No support of ( ( “?” | “:” | “-” ) /* Followed by an ns-plain-safe(c)) */ ) part
+    return isPrintable(c) && c !== CHAR_BOM
       && !isWhitespace(c) // - s-white
       // - (c-indicator ::=
       // “-” | “?” | “:” | “,” | “[” | “]” | “{” | “}”
@@ -2971,6 +3102,12 @@
       && c !== CHAR_GRAVE_ACCENT;
   }
 
+  // Simplified test for values allowed as the last character in plain style.
+  function isPlainSafeLast(c) {
+    // just not whitespace or colon, it will be checked to be plain character later
+    return !isWhitespace(c) && c !== CHAR_COLON;
+  }
+
   // Same as 'string'.codePointAt(pos), but works in older browsers.
   function codePointAt(string, pos) {
     var first = string.charCodeAt(pos), second;
@@ -3003,7 +3140,9 @@
   //    STYLE_PLAIN or STYLE_SINGLE => no \n are in the string.
   //    STYLE_LITERAL => no lines are suitable for folding (or lineWidth is -1).
   //    STYLE_FOLDED => a line > lineWidth and can be folded (and lineWidth != -1).
-  function chooseScalarStyle(string, singleLineOnly, indentPerLevel, lineWidth, testAmbiguousType) {
+  function chooseScalarStyle(string, singleLineOnly, indentPerLevel, lineWidth,
+    testAmbiguousType, quotingType, forceQuotes, inblock) {
+
     var i;
     var char = 0;
     var prevChar = null;
@@ -3012,9 +3151,9 @@
     var shouldTrackWidth = lineWidth !== -1;
     var previousLineBreak = -1; // count the first line correctly
     var plain = isPlainSafeFirst(codePointAt(string, 0))
-            && !isWhitespace(codePointAt(string, string.length - 1));
+            && isPlainSafeLast(codePointAt(string, string.length - 1));
 
-    if (singleLineOnly) {
+    if (singleLineOnly || forceQuotes) {
       // Case: no block styles.
       // Check for disallowed characters to rule out plain and single.
       for (i = 0; i < string.length; char >= 0x10000 ? i += 2 : i++) {
@@ -3022,7 +3161,7 @@
         if (!isPrintable(char)) {
           return STYLE_DOUBLE;
         }
-        plain = plain && isPlainSafe(char, prevChar);
+        plain = plain && isPlainSafe(char, prevChar, inblock);
         prevChar = char;
       }
     } else {
@@ -3042,7 +3181,7 @@
         } else if (!isPrintable(char)) {
           return STYLE_DOUBLE;
         }
-        plain = plain && isPlainSafe(char, prevChar);
+        plain = plain && isPlainSafe(char, prevChar, inblock);
         prevChar = char;
       }
       // in case the end is missing a \n
@@ -3056,8 +3195,10 @@
     if (!hasLineBreak && !hasFoldableLine) {
       // Strings interpretable as another type have to be quoted;
       // e.g. the string 'true' vs. the boolean true.
-      return plain && !testAmbiguousType(string)
-        ? STYLE_PLAIN : STYLE_SINGLE;
+      if (plain && !forceQuotes && !testAmbiguousType(string)) {
+        return STYLE_PLAIN;
+      }
+      return quotingType === QUOTING_TYPE_DOUBLE ? STYLE_DOUBLE : STYLE_SINGLE;
     }
     // Edge case: block indentation indicator can only have one digit.
     if (indentPerLevel > 9 && needIndentIndicator(string)) {
@@ -3065,7 +3206,10 @@
     }
     // At this point we know block styles are valid.
     // Prefer literal style unless we want to fold.
-    return hasFoldableLine ? STYLE_FOLDED : STYLE_LITERAL;
+    if (!forceQuotes) {
+      return hasFoldableLine ? STYLE_FOLDED : STYLE_LITERAL;
+    }
+    return quotingType === QUOTING_TYPE_DOUBLE ? STYLE_DOUBLE : STYLE_SINGLE;
   }
 
   // Note: line breaking/folding is implemented for only the folded style.
@@ -3074,14 +3218,15 @@
   //    • No ending newline => unaffected; already using strip "-" chomping.
   //    • Ending newline    => removed then restored.
   //  Importantly, this keeps the "+" chomp indicator from gaining an extra line.
-  function writeScalar(state, string, level, iskey) {
+  function writeScalar(state, string, level, iskey, inblock) {
     state.dump = (function () {
       if (string.length === 0) {
-        return "''";
+        return state.quotingType === QUOTING_TYPE_DOUBLE ? '""' : "''";
       }
-      if (!state.noCompatMode &&
-          DEPRECATED_BOOLEANS_SYNTAX.indexOf(string) !== -1) {
-        return "'" + string + "'";
+      if (!state.noCompatMode) {
+        if (DEPRECATED_BOOLEANS_SYNTAX.indexOf(string) !== -1 || DEPRECATED_BASE60_SYNTAX.test(string)) {
+          return state.quotingType === QUOTING_TYPE_DOUBLE ? ('"' + string + '"') : ("'" + string + "'");
+        }
       }
 
       var indent = state.indent * Math.max(1, level); // no 0-indent scalars
@@ -3103,7 +3248,9 @@
         return testImplicitResolving(state, string);
       }
 
-      switch (chooseScalarStyle(string, singleLineOnly, state.indent, lineWidth, testAmbiguity)) {
+      switch (chooseScalarStyle(string, singleLineOnly, state.indent, lineWidth,
+        testAmbiguity, state.quotingType, state.forceQuotes && !iskey, inblock)) {
+
         case STYLE_PLAIN:
           return string;
         case STYLE_SINGLE:
@@ -3242,12 +3389,22 @@
     var _result = '',
         _tag    = state.tag,
         index,
-        length;
+        length,
+        value;
 
     for (index = 0, length = object.length; index < length; index += 1) {
-      // Write only valid elements.
-      if (writeNode(state, level, object[index], false, false)) {
-        if (index !== 0) _result += ',' + (!state.condenseFlow ? ' ' : '');
+      value = object[index];
+
+      if (state.replacer) {
+        value = state.replacer.call(object, String(index), value);
+      }
+
+      // Write only valid elements, put null instead of invalid elements.
+      if (writeNode(state, level, value, false, false) ||
+          (typeof value === 'undefined' &&
+           writeNode(state, level, null, false, false))) {
+
+        if (_result !== '') _result += ',' + (!state.condenseFlow ? ' ' : '');
         _result += state.dump;
       }
     }
@@ -3260,12 +3417,22 @@
     var _result = '',
         _tag    = state.tag,
         index,
-        length;
+        length,
+        value;
 
     for (index = 0, length = object.length; index < length; index += 1) {
-      // Write only valid elements.
-      if (writeNode(state, level + 1, object[index], true, true, false, true)) {
-        if (!compact || index !== 0) {
+      value = object[index];
+
+      if (state.replacer) {
+        value = state.replacer.call(object, String(index), value);
+      }
+
+      // Write only valid elements, put null instead of invalid elements.
+      if (writeNode(state, level + 1, value, true, true, false, true) ||
+          (typeof value === 'undefined' &&
+           writeNode(state, level + 1, null, true, true, false, true))) {
+
+        if (!compact || _result !== '') {
           _result += generateNextLine(state, level);
         }
 
@@ -3296,13 +3463,17 @@
     for (index = 0, length = objectKeyList.length; index < length; index += 1) {
 
       pairBuffer = '';
-      if (index !== 0) pairBuffer += ', ';
+      if (_result !== '') pairBuffer += ', ';
 
       if (state.condenseFlow) pairBuffer += '"';
 
       objectKey = objectKeyList[index];
       objectValue = object[objectKey];
 
+      if (state.replacer) {
+        objectValue = state.replacer.call(object, objectKey, objectValue);
+      }
+
       if (!writeNode(state, level, objectKey, false, false)) {
         continue; // Skip this pair because of invalid key;
       }
@@ -3351,13 +3522,17 @@
     for (index = 0, length = objectKeyList.length; index < length; index += 1) {
       pairBuffer = '';
 
-      if (!compact || index !== 0) {
+      if (!compact || _result !== '') {
         pairBuffer += generateNextLine(state, level);
       }
 
       objectKey = objectKeyList[index];
       objectValue = object[objectKey];
 
+      if (state.replacer) {
+        objectValue = state.replacer.call(object, objectKey, objectValue);
+      }
+
       if (!writeNode(state, level + 1, objectKey, true, true, true)) {
         continue; // Skip this pair because of invalid key.
       }
@@ -3411,7 +3586,15 @@
           (!type.instanceOf || ((typeof object === 'object') && (object instanceof type.instanceOf))) &&
           (!type.predicate  || type.predicate(object))) {
 
-        state.tag = explicit ? type.tag : '?';
+        if (explicit) {
+          if (type.multi && type.representName) {
+            state.tag = type.representName(object);
+          } else {
+            state.tag = type.tag;
+          }
+        } else {
+          state.tag = '?';
+        }
 
         if (type.represent) {
           style = state.styleMap[type.tag] || type.defaultStyle;
@@ -3446,6 +3629,8 @@
     }
 
     var type = _toString$2.call(state.dump);
+    var inblock = block;
+    var tagStr;
 
     if (block) {
       block = (state.flowLevel < 0 || state.flowLevel > level);
@@ -3500,15 +3685,42 @@
         }
       } else if (type === '[object String]') {
         if (state.tag !== '?') {
-          writeScalar(state, state.dump, level, iskey);
+          writeScalar(state, state.dump, level, iskey, inblock);
         }
+      } else if (type === '[object Undefined]') {
+        return false;
       } else {
         if (state.skipInvalid) return false;
         throw new exception('unacceptable kind of an object to dump ' + type);
       }
 
       if (state.tag !== null && state.tag !== '?') {
-        state.dump = '!<' + state.tag + '> ' + state.dump;
+        // Need to encode all characters except those allowed by the spec:
+        //
+        // [35] ns-dec-digit    ::=  [#x30-#x39] /* 0-9 */
+        // [36] ns-hex-digit    ::=  ns-dec-digit
+        //                         | [#x41-#x46] /* A-F */ | [#x61-#x66] /* a-f */
+        // [37] ns-ascii-letter ::=  [#x41-#x5A] /* A-Z */ | [#x61-#x7A] /* a-z */
+        // [38] ns-word-char    ::=  ns-dec-digit | ns-ascii-letter | “-”
+        // [39] ns-uri-char     ::=  “%” ns-hex-digit ns-hex-digit | ns-word-char | “#”
+        //                         | “;” | “/” | “?” | “:” | “@” | “&” | “=” | “+” | “$” | “,”
+        //                         | “_” | “.” | “!” | “~” | “*” | “'” | “(” | “)” | “[” | “]”
+        //
+        // Also need to encode '!' because it has special meaning (end of tag prefix).
+        //
+        tagStr = encodeURI(
+          state.tag[0] === '!' ? state.tag.slice(1) : state.tag
+        ).replace(/!/g, '%21');
+
+        if (state.tag[0] === '!') {
+          tagStr = '!' + tagStr;
+        } else if (tagStr.slice(0, 18) === 'tag:yaml.org,2002:') {
+          tagStr = '!!' + tagStr.slice(18);
+        } else {
+          tagStr = '!<' + tagStr + '>';
+        }
+
+        state.dump = tagStr + ' ' + state.dump;
       }
     }
 
@@ -3565,7 +3777,13 @@
 
     if (!state.noRefs) getDuplicateReferences(input, state);
 
-    if (writeNode(state, 0, input, true, true)) return state.dump + '\n';
+    var value = input;
+
+    if (state.replacer) {
+      value = state.replacer.call({ '': value }, '', value);
+    }
+
+    if (writeNode(state, 0, value, true, true)) return state.dump + '\n';
 
     return '';
   }
diff --git a/dist/js-yaml.min.js b/dist/js-yaml.min.js
index 126b033b..6a469523 100644
--- a/dist/js-yaml.min.js
+++ b/dist/js-yaml.min.js
@@ -1,2 +1,2 @@
-/*! js-yaml 3.14.0 https://github.com/nodeca/js-yaml @license MIT */
-!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?e(exports):"function"==typeof define&&define.amd?define(["exports"],e):e((t="undefined"!=typeof globalThis?globalThis:t||self).jsyaml={})}(this,(function(t){"use strict";function e(t){return null==t}var n={isNothing:e,isObject:function(t){return"object"==typeof t&&null!==t},toArray:function(t){return Array.isArray(t)?t:e(t)?[]:[t]},repeat:function(t,e){var n,i="";for(n=0;n<e;n+=1)i+=t;return i},isNegativeZero:function(t){return 0===t&&Number.NEGATIVE_INFINITY===1/t},extend:function(t,e){var n,i,r,o;if(e)for(n=0,i=(o=Object.keys(e)).length;n<i;n+=1)t[r=o[n]]=e[r];return t}};function i(t,e){Error.call(this),this.name="YAMLException",this.reason=t,this.mark=e,this.message=(this.reason||"(unknown reason)")+(this.mark?" 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p,f,d="[object Object]"===s||"[object Array]"===s;if(d&&(f=-1!==(p=e.duplicates.indexOf(n))),(null!==e.tag&&"?"!==e.tag||f||2!==e.indent&&t>0)&&(r=!1),f&&e.usedDuplicates[p])e.dump="*ref_"+p;else{if(d&&f&&!e.usedDuplicates[p]&&(e.usedDuplicates[p]=!0),"[object Object]"===s)i&&0!==Object.keys(e.dump).length?(!function(e,t,n,i){var r,a,l,c,s,u,p="",f=e.tag,d=Object.keys(n);if(!0===e.sortKeys)d.sort();else if("function"==typeof e.sortKeys)d.sort(e.sortKeys);else if(e.sortKeys)throw new o("sortKeys must be a boolean or a function");for(r=0,a=d.length;r<a;r+=1)u="",i&&""===p||(u+=Fe(e,t)),c=n[l=d[r]],e.replacer&&(c=e.replacer.call(n,l,c)),He(e,t+1,l,!0,!0,!0)&&((s=null!==e.tag&&"?"!==e.tag||e.dump&&e.dump.length>1024)&&(e.dump&&10===e.dump.charCodeAt(0)?u+="?":u+="? "),u+=e.dump,s&&(u+=Fe(e,t)),He(e,t+1,c,!0,s)&&(e.dump&&10===e.dump.charCodeAt(0)?u+=":":u+=": ",p+=u+=e.dump));e.tag=f,e.dump=p||"{}"}(e,t,e.dump,r),f&&(e.dump="&ref_"+p+e.dump)):(!function(e,t,n){var i,r,o,a,l,c="",s=e.tag,u=Object.keys(n);for(i=0,r=u.length;i<r;i+=1)l="",""!==c&&(l+=", "),e.condenseFlow&&(l+='"'),a=n[o=u[i]],e.replacer&&(a=e.replacer.call(n,o,a)),He(e,t,o,!1,!1)&&(e.dump.length>1024&&(l+="? "),l+=e.dump+(e.condenseFlow?'"':"")+":"+(e.condenseFlow?"":" "),He(e,t,a,!1,!1)&&(c+=l+=e.dump));e.tag=s,e.dump="{"+c+"}"}(e,t,e.dump),f&&(e.dump="&ref_"+p+" "+e.dump));else if("[object Array]"===s)i&&0!==e.dump.length?(e.noArrayIndent&&!l&&t>0?Pe(e,t-1,e.dump,r):Pe(e,t,e.dump,r),f&&(e.dump="&ref_"+p+e.dump)):(!function(e,t,n){var i,r,o,a="",l=e.tag;for(i=0,r=n.length;i<r;i+=1)o=n[i],e.replacer&&(o=e.replacer.call(n,String(i),o)),(He(e,t,o,!1,!1)||void 0===o&&He(e,t,null,!1,!1))&&(""!==a&&(a+=","+(e.condenseFlow?"":" ")),a+=e.dump);e.tag=l,e.dump="["+a+"]"}(e,t,e.dump),f&&(e.dump="&ref_"+p+" "+e.dump));else{if("[object String]"!==s){if("[object Undefined]"===s)return!1;if(e.skipInvalid)return!1;throw new o("unacceptable kind of an object to dump "+s)}"?"!==e.tag&&qe(e,e.dump,t,a,u)}null!==e.tag&&"?"!==e.tag&&(c=encodeURI("!"===e.tag[0]?e.tag.slice(1):e.tag).replace(/!/g,"%21"),c="!"===e.tag[0]?"!"+c:"tag:yaml.org,2002:"===c.slice(0,18)?"!!"+c.slice(18):"!<"+c+">",e.dump=c+" "+e.dump)}return!0}function $e(e,t){var n,i,r=[],o=[];for(Ge(e,r,o),n=0,i=o.length;n<i;n+=1)t.duplicates.push(r[o[n]]);t.usedDuplicates=new Array(i)}function Ge(e,t,n){var i,r,o;if(null!==e&&"object"==typeof e)if(-1!==(r=t.indexOf(e)))-1===n.indexOf(r)&&n.push(r);else if(t.push(e),Array.isArray(e))for(r=0,o=e.length;r<o;r+=1)Ge(e[r],t,n);else for(r=0,o=(i=Object.keys(e)).length;r<o;r+=1)Ge(e[i[r]],t,n)}function Ve(e,t){return function(){throw new Error("Function yaml."+e+" is removed in js-yaml 4. Use yaml."+t+" instead, which is now safe by default.")}}var Ze=p,Je=h,Qe=g,ze=x,Xe=I,et=q,tt=we.load,nt=we.loadAll,it={dump:function(e,t){var n=new Te(t=t||{});n.noRefs||$e(e,n);var i=e;return n.replacer&&(i=n.replacer.call({"":i},"",i)),He(n,0,i,!0,!0)?n.dump+"\n":""}}.dump,rt=o,ot=Ve("safeLoad","load"),at=Ve("safeLoadAll","loadAll"),lt=Ve("safeDump","dump"),ct={Type:Ze,Schema:Je,FAILSAFE_SCHEMA:Qe,JSON_SCHEMA:ze,CORE_SCHEMA:Xe,DEFAULT_SCHEMA:et,load:tt,loadAll:nt,dump:it,YAMLException:rt,safeLoad:ot,safeLoadAll:at,safeDump:lt};e.CORE_SCHEMA=Xe,e.DEFAULT_SCHEMA=et,e.FAILSAFE_SCHEMA=Qe,e.JSON_SCHEMA=ze,e.Schema=Je,e.Type=Ze,e.YAMLException=rt,e.default=ct,e.dump=it,e.load=tt,e.loadAll=nt,e.safeDump=lt,e.safeLoad=ot,e.safeLoadAll=at,Object.defineProperty(e,"__esModule",{value:!0})}));
diff --git a/dist/js-yaml.mjs b/dist/js-yaml.mjs
index 213ef705..9f3a1f7a 100644
--- a/dist/js-yaml.mjs
+++ b/dist/js-yaml.mjs
@@ -1,5 +1,5 @@
 
-/*! js-yaml 3.14.0 https://github.com/nodeca/js-yaml @license MIT */
+/*! js-yaml 4.0.0 https://github.com/nodeca/js-yaml @license MIT */
 function isNothing(subject) {
   return (typeof subject === 'undefined') || (subject === null);
 }
@@ -68,6 +68,26 @@ var common = {
 
 // YAML error class. http://stackoverflow.com/questions/8458984
 
+
+function formatError(exception, compact) {
+  var where = '', message = exception.reason || '(unknown reason)';
+
+  if (!exception.mark) return message;
+
+  if (exception.mark.name) {
+    where += 'in "' + exception.mark.name + '" ';
+  }
+
+  where += '(' + (exception.mark.line + 1) + ':' + (exception.mark.column + 1) + ')';
+
+  if (!compact && exception.mark.snippet) {
+    where += '\n\n' + exception.mark.snippet;
+  }
+
+  return message + ' ' + where;
+}
+
+
 function YAMLException(reason, mark) {
   // Super constructor
   Error.call(this);
@@ -75,7 +95,7 @@ function YAMLException(reason, mark) {
   this.name = 'YAMLException';
   this.reason = reason;
   this.mark = mark;
-  this.message = (this.reason || '(unknown reason)') + (this.mark ? ' ' + this.mark.toString() : '');
+  this.message = formatError(this, false);
 
   // Include stack trace in error object
   if (Error.captureStackTrace) {
@@ -94,98 +114,117 @@ YAMLException.prototype.constructor = YAMLException;
 
 
 YAMLException.prototype.toString = function toString(compact) {
-  var result = this.name + ': ';
+  return this.name + ': ' + formatError(this, compact);
+};
 
-  result += this.reason || '(unknown reason)';
 
-  if (!compact && this.mark) {
-    result += ' ' + this.mark.toString();
-  }
+var exception = YAMLException;
 
-  return result;
-};
+// get snippet for a single line, respecting maxLength
+function getLine(buffer, lineStart, lineEnd, position, maxLineLength) {
+  var head = '';
+  var tail = '';
+  var maxHalfLength = Math.floor(maxLineLength / 2) - 1;
 
+  if (position - lineStart > maxHalfLength) {
+    head = ' ... ';
+    lineStart = position - maxHalfLength + head.length;
+  }
 
-var exception = YAMLException;
+  if (lineEnd - position > maxHalfLength) {
+    tail = ' ...';
+    lineEnd = position + maxHalfLength - tail.length;
+  }
 
-function Mark(name, buffer, position, line, column) {
-  this.name     = name;
-  this.buffer   = buffer;
-  this.position = position;
-  this.line     = line;
-  this.column   = column;
+  return {
+    str: head + buffer.slice(lineStart, lineEnd).replace(/\t/g, '→') + tail,
+    pos: position - lineStart + head.length // relative position
+  };
 }
 
 
-Mark.prototype.getSnippet = function getSnippet(indent, maxLength) {
-  var head, start, tail, end, snippet;
+function padStart(string, max) {
+  return common.repeat(' ', max - string.length) + string;
+}
 
-  if (!this.buffer) return null;
 
-  indent = indent || 4;
-  maxLength = maxLength || 75;
+function makeSnippet(mark, options) {
+  options = Object.create(options || null);
 
-  head = '';
-  start = this.position;
+  if (!mark.buffer) return null;
 
-  while (start > 0 && '\x00\r\n\x85\u2028\u2029'.indexOf(this.buffer.charAt(start - 1)) === -1) {
-    start -= 1;
-    if (this.position - start > (maxLength / 2 - 1)) {
-      head = ' ... ';
-      start += 5;
-      break;
-    }
-  }
+  if (!options.maxLength) options.maxLength = 79;
+  if (typeof options.indent      !== 'number') options.indent      = 1;
+  if (typeof options.linesBefore !== 'number') options.linesBefore = 3;
+  if (typeof options.linesAfter  !== 'number') options.linesAfter  = 2;
 
-  tail = '';
-  end = this.position;
+  var re = /\r?\n|\r|\0/g;
+  var lineStarts = [ 0 ];
+  var lineEnds = [];
+  var match;
+  var foundLineNo = -1;
 
-  while (end < this.buffer.length && '\x00\r\n\x85\u2028\u2029'.indexOf(this.buffer.charAt(end)) === -1) {
-    end += 1;
-    if (end - this.position > (maxLength / 2 - 1)) {
-      tail = ' ... ';
-      end -= 5;
-      break;
+  while ((match = re.exec(mark.buffer))) {
+    lineEnds.push(match.index);
+    lineStarts.push(match.index + match[0].length);
+
+    if (mark.position <= match.index && foundLineNo < 0) {
+      foundLineNo = lineStarts.length - 2;
     }
   }
 
-  snippet = this.buffer.slice(start, end);
-
-  return common.repeat(' ', indent) + head + snippet + tail + '\n' +
-         common.repeat(' ', indent + this.position - start + head.length) + '^';
-};
-
+  if (foundLineNo < 0) foundLineNo = lineStarts.length - 1;
 
-Mark.prototype.toString = function toString(compact) {
-  var snippet, where = '';
+  var result = '', i, line;
+  var lineNoLength = Math.min(mark.line + options.linesAfter, lineEnds.length).toString().length;
+  var maxLineLength = options.maxLength - (options.indent + lineNoLength + 3);
 
-  if (this.name) {
-    where += 'in "' + this.name + '" ';
+  for (i = 1; i <= options.linesBefore; i++) {
+    if (foundLineNo - i < 0) break;
+    line = getLine(
+      mark.buffer,
+      lineStarts[foundLineNo - i],
+      lineEnds[foundLineNo - i],
+      mark.position - (lineStarts[foundLineNo] - lineStarts[foundLineNo - i]),
+      maxLineLength
+    );
+    result = common.repeat(' ', options.indent) + padStart((mark.line - i + 1).toString(), lineNoLength) +
+      ' | ' + line.str + '\n' + result;
   }
 
-  where += 'at line ' + (this.line + 1) + ', column ' + (this.column + 1);
+  line = getLine(mark.buffer, lineStarts[foundLineNo], lineEnds[foundLineNo], mark.position, maxLineLength);
+  result += common.repeat(' ', options.indent) + padStart((mark.line + 1).toString(), lineNoLength) +
+    ' | ' + line.str + '\n';
+  result += common.repeat('-', options.indent + lineNoLength + 3 + line.pos) + '^' + '\n';
 
-  if (!compact) {
-    snippet = this.getSnippet();
-
-    if (snippet) {
-      where += ':\n' + snippet;
-    }
+  for (i = 1; i <= options.linesAfter; i++) {
+    if (foundLineNo + i >= lineEnds.length) break;
+    line = getLine(
+      mark.buffer,
+      lineStarts[foundLineNo + i],
+      lineEnds[foundLineNo + i],
+      mark.position - (lineStarts[foundLineNo] - lineStarts[foundLineNo + i]),
+      maxLineLength
+    );
+    result += common.repeat(' ', options.indent) + padStart((mark.line + i + 1).toString(), lineNoLength) +
+      ' | ' + line.str + '\n';
   }
 
-  return where;
-};
+  return result.replace(/\n$/, '');
+}
 
 
-var mark = Mark;
+var snippet = makeSnippet;
 
 var TYPE_CONSTRUCTOR_OPTIONS = [
   'kind',
+  'multi',
   'resolve',
   'construct',
   'instanceOf',
   'predicate',
   'represent',
+  'representName',
   'defaultStyle',
   'styleAliases'
 ];
@@ -220,15 +259,17 @@ function Type(tag, options) {
   });
 
   // TODO: Add tag format check.
-  this.tag          = tag;
-  this.kind         = options['kind']         || null;
-  this.resolve      = options['resolve']      || function () { return true; };
-  this.construct    = options['construct']    || function (data) { return data; };
-  this.instanceOf   = options['instanceOf']   || null;
-  this.predicate    = options['predicate']    || null;
-  this.represent    = options['represent']    || null;
-  this.defaultStyle = options['defaultStyle'] || null;
-  this.styleAliases = compileStyleAliases(options['styleAliases'] || null);
+  this.tag           = tag;
+  this.kind          = options['kind']          || null;
+  this.resolve       = options['resolve']       || function () { return true; };
+  this.construct     = options['construct']     || function (data) { return data; };
+  this.instanceOf    = options['instanceOf']    || null;
+  this.predicate     = options['predicate']     || null;
+  this.represent     = options['represent']     || null;
+  this.representName = options['representName'] || null;
+  this.defaultStyle  = options['defaultStyle']  || null;
+  this.multi         = options['multi']         || false;
+  this.styleAliases  = compileStyleAliases(options['styleAliases'] || null);
 
   if (YAML_NODE_KINDS.indexOf(this.kind) === -1) {
     throw new exception('Unknown kind "' + this.kind + '" is specified for "' + tag + '" YAML type.');
@@ -248,7 +289,10 @@ function compileList(schema, name, result) {
 
   schema[name].forEach(function (currentType) {
     result.forEach(function (previousType, previousIndex) {
-      if (previousType.tag === currentType.tag && previousType.kind === currentType.kind) {
+      if (previousType.tag === currentType.tag &&
+          previousType.kind === currentType.kind &&
+          previousType.multi === currentType.multi) {
+
         exclude.push(previousIndex);
       }
     });
@@ -267,11 +311,22 @@ function compileMap(/* lists... */) {
         scalar: {},
         sequence: {},
         mapping: {},
-        fallback: {}
+        fallback: {},
+        multi: {
+          scalar: [],
+          sequence: [],
+          mapping: [],
+          fallback: []
+        }
       }, index, length;
 
   function collectType(type) {
-    result[type.kind][type.tag] = result['fallback'][type.tag] = type;
+    if (type.multi) {
+      result.multi[type.kind].push(type);
+      result.multi['fallback'].push(type);
+    } else {
+      result[type.kind][type.tag] = result['fallback'][type.tag] = type;
+    }
   }
 
   for (index = 0, length = arguments.length; index < length; index += 1) {
@@ -316,6 +371,10 @@ Schema.prototype.extend = function extend(definition) {
     if (type$1.loadKind && type$1.loadKind !== 'scalar') {
       throw new exception('There is a non-scalar type in the implicit list of a schema. Implicit resolving of such types is not supported.');
     }
+
+    if (type$1.multi) {
+      throw new exception('There is a multi type in the implicit list of a schema. Multi tags can only be listed as explicit.');
+    }
   });
 
   explicit.forEach(function (type$1) {
@@ -388,7 +447,8 @@ var _null = new type('tag:yaml.org,2002:null', {
     canonical: function () { return '~';    },
     lowercase: function () { return 'null'; },
     uppercase: function () { return 'NULL'; },
-    camelcase: function () { return 'Null'; }
+    camelcase: function () { return 'Null'; },
+    empty:     function () { return '';     }
   },
   defaultStyle: 'lowercase'
 });
@@ -490,17 +550,22 @@ function resolveYamlInteger(data) {
       return hasDigits && ch !== '_';
     }
 
-    // base 8
-    for (; index < max; index++) {
-      ch = data[index];
-      if (ch === '_') continue;
-      if (!isOctCode(data.charCodeAt(index))) return false;
-      hasDigits = true;
+
+    if (ch === 'o') {
+      // base 8
+      index++;
+
+      for (; index < max; index++) {
+        ch = data[index];
+        if (ch === '_') continue;
+        if (!isOctCode(data.charCodeAt(index))) return false;
+        hasDigits = true;
+      }
+      return hasDigits && ch !== '_';
     }
-    return hasDigits && ch !== '_';
   }
 
-  // base 10 (except 0) or base 60
+  // base 10 (except 0)
 
   // value should not start with `_`;
   if (ch === '_') return false;
@@ -508,7 +573,6 @@ function resolveYamlInteger(data) {
   for (; index < max; index++) {
     ch = data[index];
     if (ch === '_') continue;
-    if (ch === ':') break;
     if (!isDecCode(data.charCodeAt(index))) {
       return false;
     }
@@ -518,15 +582,11 @@ function resolveYamlInteger(data) {
   // Should have digits and should not end with `_`
   if (!hasDigits || ch === '_') return false;
 
-  // if !base60 - done;
-  if (ch !== ':') return true;
-
-  // base60 almost not used, no needs to optimize
-  return /^(:[0-5]?[0-9])+$/.test(data.slice(index));
+  return true;
 }
 
 function constructYamlInteger(data) {
-  var value = data, sign = 1, ch, base, digits = [];
+  var value = data, sign = 1, ch;
 
   if (value.indexOf('_') !== -1) {
     value = value.replace(/_/g, '');
@@ -544,25 +604,8 @@ function constructYamlInteger(data) {
 
   if (ch === '0') {
     if (value[1] === 'b') return sign * parseInt(value.slice(2), 2);
-    if (value[1] === 'x') return sign * parseInt(value, 16);
-    return sign * parseInt(value, 8);
-  }
-
-  if (value.indexOf(':') !== -1) {
-    value.split(':').forEach(function (v) {
-      digits.unshift(parseInt(v, 10));
-    });
-
-    value = 0;
-    base = 1;
-
-    digits.forEach(function (d) {
-      value += (d * base);
-      base *= 60;
-    });
-
-    return sign * value;
-
+    if (value[1] === 'x') return sign * parseInt(value.slice(2), 16);
+    if (value[1] === 'o') return sign * parseInt(value.slice(2), 8);
   }
 
   return sign * parseInt(value, 10);
@@ -580,7 +623,7 @@ var int = new type('tag:yaml.org,2002:int', {
   predicate: isInteger,
   represent: {
     binary:      function (obj) { return obj >= 0 ? '0b' + obj.toString(2) : '-0b' + obj.toString(2).slice(1); },
-    octal:       function (obj) { return obj >= 0 ? '0'  + obj.toString(8) : '-0'  + obj.toString(8).slice(1); },
+    octal:       function (obj) { return obj >= 0 ? '0o'  + obj.toString(8) : '-0o'  + obj.toString(8).slice(1); },
     decimal:     function (obj) { return obj.toString(10); },
     /* eslint-disable max-len */
     hexadecimal: function (obj) { return obj >= 0 ? '0x' + obj.toString(16).toUpperCase() :  '-0x' + obj.toString(16).toUpperCase().slice(1); }
@@ -596,12 +639,10 @@ var int = new type('tag:yaml.org,2002:int', {
 
 var YAML_FLOAT_PATTERN = new RegExp(
   // 2.5e4, 2.5 and integers
-  '^(?:[-+]?(?:0|[1-9][0-9_]*)(?:\\.[0-9_]*)?(?:[eE][-+]?[0-9]+)?' +
+  '^(?:[-+]?(?:[0-9][0-9_]*)(?:\\.[0-9_]*)?(?:[eE][-+]?[0-9]+)?' +
   // .2e4, .2
   // special case, seems not from spec
   '|\\.[0-9_]+(?:[eE][-+]?[0-9]+)?' +
-  // 20:59
-  '|[-+]?[0-9][0-9_]*(?::[0-5]?[0-9])+\\.[0-9_]*' +
   // .inf
   '|[-+]?\\.(?:inf|Inf|INF)' +
   // .nan
@@ -621,11 +662,10 @@ function resolveYamlFloat(data) {
 }
 
 function constructYamlFloat(data) {
-  var value, sign, base, digits;
+  var value, sign;
 
   value  = data.replace(/_/g, '').toLowerCase();
   sign   = value[0] === '-' ? -1 : 1;
-  digits = [];
 
   if ('+-'.indexOf(value[0]) >= 0) {
     value = value.slice(1);
@@ -636,22 +676,6 @@ function constructYamlFloat(data) {
 
   } else if (value === '.nan') {
     return NaN;
-
-  } else if (value.indexOf(':') >= 0) {
-    value.split(':').forEach(function (v) {
-      digits.unshift(parseFloat(v, 10));
-    });
-
-    value = 0.0;
-    base = 1;
-
-    digits.forEach(function (d) {
-      value += d * base;
-      base *= 60;
-    });
-
-    return sign * value;
-
   }
   return sign * parseFloat(value, 10);
 }
@@ -811,19 +835,8 @@ var merge = new type('tag:yaml.org,2002:merge', {
   resolve: resolveYamlMerge
 });
 
-function commonjsRequire (target) {
-	throw new Error('Could not dynamically require "' + target + '". Please configure the dynamicRequireTargets option of @rollup/plugin-commonjs appropriately for this require call to behave properly.');
-}
-
 /*eslint-disable no-bitwise*/
 
-var NodeBuffer;
-
-try {
-  // A trick for browserified version, to not include `Buffer` shim
-  var _require = commonjsRequire;
-  NodeBuffer = _require('buffer').Buffer;
-} catch (__) {}
 
 
 
@@ -889,13 +902,7 @@ function constructYamlBinary(data) {
     result.push((bits >> 4) & 0xFF);
   }
 
-  // Wrap into Buffer for NodeJS and leave Array for browser
-  if (NodeBuffer) {
-    // Support node 6.+ Buffer API when available
-    return NodeBuffer.from ? NodeBuffer.from(result) : new NodeBuffer(result);
-  }
-
-  return result;
+  return new Uint8Array(result);
 }
 
 function representYamlBinary(object /*, style*/) {
@@ -940,8 +947,8 @@ function representYamlBinary(object /*, style*/) {
   return result;
 }
 
-function isBinary(object) {
-  return NodeBuffer && NodeBuffer.isBuffer(object);
+function isBinary(obj) {
+  return Object.prototype.toString.call(obj) ===  '[object Uint8Array]';
 }
 
 var binary = new type('tag:yaml.org,2002:binary', {
@@ -1216,7 +1223,10 @@ function State(input, options) {
   this.filename  = options['filename']  || null;
   this.schema    = options['schema']    || _default;
   this.onWarning = options['onWarning'] || null;
+  // (Hidden) Remove? makes the loader to expect YAML 1.1 documents
+  // if such documents have no explicit %YAML directive
   this.legacy    = options['legacy']    || false;
+
   this.json      = options['json']      || false;
   this.listener  = options['listener']  || null;
 
@@ -1229,6 +1239,10 @@ function State(input, options) {
   this.lineStart  = 0;
   this.lineIndent = 0;
 
+  // position of first leading tab in the current line,
+  // used to make sure there are no tabs in the indentation
+  this.firstTabInLine = -1;
+
   this.documents = [];
 
   /*
@@ -1245,9 +1259,17 @@ function State(input, options) {
 
 
 function generateError(state, message) {
-  return new exception(
-    message,
-    new mark(state.filename, state.input, state.position, state.line, (state.position - state.lineStart)));
+  var mark = {
+    name:     state.filename,
+    buffer:   state.input.slice(0, -1), // omit trailing \0
+    position: state.position,
+    line:     state.line,
+    column:   state.position - state.lineStart
+  };
+
+  mark.snippet = snippet(mark);
+
+  return new exception(message, mark);
 }
 
 function throwError(state, message) {
@@ -1319,6 +1341,12 @@ var directiveHandlers = {
       throwError(state, 'ill-formed tag prefix (second argument) of the TAG directive');
     }
 
+    try {
+      prefix = decodeURIComponent(prefix);
+    } catch (err) {
+      throwError(state, 'tag prefix is malformed: ' + prefix);
+    }
+
     state.tagMap[handle] = prefix;
   }
 };
@@ -1365,7 +1393,9 @@ function mergeMappings(state, destination, source, overridableKeys) {
   }
 }
 
-function storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode, startLine, startPos) {
+function storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode,
+  startLine, startLineStart, startPos) {
+
   var index, quantity;
 
   // The output is a plain object here, so keys can only be strings.
@@ -1412,10 +1442,22 @@ function storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valu
         !_hasOwnProperty$2.call(overridableKeys, keyNode) &&
         _hasOwnProperty$2.call(_result, keyNode)) {
       state.line = startLine || state.line;
+      state.lineStart = startLineStart || state.lineStart;
       state.position = startPos || state.position;
       throwError(state, 'duplicated mapping key');
     }
-    _result[keyNode] = valueNode;
+
+    // used for this specific key only because Object.defineProperty is slow
+    if (keyNode === '__proto__') {
+      Object.defineProperty(_result, keyNode, {
+        configurable: true,
+        enumerable: true,
+        writable: true,
+        value: valueNode
+      });
+    } else {
+      _result[keyNode] = valueNode;
+    }
     delete overridableKeys[keyNode];
   }
 
@@ -1440,6 +1482,7 @@ function readLineBreak(state) {
 
   state.line += 1;
   state.lineStart = state.position;
+  state.firstTabInLine = -1;
 }
 
 function skipSeparationSpace(state, allowComments, checkIndent) {
@@ -1448,6 +1491,9 @@ function skipSeparationSpace(state, allowComments, checkIndent) {
 
   while (ch !== 0) {
     while (is_WHITE_SPACE(ch)) {
+      if (ch === 0x09/* Tab */ && state.firstTabInLine === -1) {
+        state.firstTabInLine = state.position;
+      }
       ch = state.input.charCodeAt(++state.position);
     }
 
@@ -1749,6 +1795,8 @@ function readDoubleQuotedScalar(state, nodeIndent) {
 function readFlowCollection(state, nodeIndent) {
   var readNext = true,
       _line,
+      _lineStart,
+      _pos,
       _tag     = state.tag,
       _result,
       _anchor  = state.anchor,
@@ -1757,7 +1805,7 @@ function readFlowCollection(state, nodeIndent) {
       isPair,
       isExplicitPair,
       isMapping,
-      overridableKeys = {},
+      overridableKeys = Object.create(null),
       keyNode,
       keyTag,
       valueNode,
@@ -1797,6 +1845,9 @@ function readFlowCollection(state, nodeIndent) {
       return true;
     } else if (!readNext) {
       throwError(state, 'missed comma between flow collection entries');
+    } else if (ch === 0x2C/* , */) {
+      // "flow collection entries can never be completely empty", as per YAML 1.2, section 7.4
+      throwError(state, "expected the node content, but found ','");
     }
 
     keyTag = keyNode = valueNode = null;
@@ -1812,7 +1863,9 @@ function readFlowCollection(state, nodeIndent) {
       }
     }
 
-    _line = state.line;
+    _line = state.line; // Save the current line.
+    _lineStart = state.lineStart;
+    _pos = state.position;
     composeNode(state, nodeIndent, CONTEXT_FLOW_IN, false, true);
     keyTag = state.tag;
     keyNode = state.result;
@@ -1829,9 +1882,9 @@ function readFlowCollection(state, nodeIndent) {
     }
 
     if (isMapping) {
-      storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode);
+      storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode, _line, _lineStart, _pos);
     } else if (isPair) {
-      _result.push(storeMappingPair(state, null, overridableKeys, keyTag, keyNode, valueNode));
+      _result.push(storeMappingPair(state, null, overridableKeys, keyTag, keyNode, valueNode, _line, _lineStart, _pos));
     } else {
       _result.push(keyNode);
     }
@@ -2003,6 +2056,10 @@ function readBlockSequence(state, nodeIndent) {
       detected  = false,
       ch;
 
+  // there is a leading tab before this token, so it can't be a block sequence/mapping;
+  // it can still be flow sequence/mapping or a scalar
+  if (state.firstTabInLine !== -1) return false;
+
   if (state.anchor !== null) {
     state.anchorMap[state.anchor] = _result;
   }
@@ -2010,6 +2067,10 @@ function readBlockSequence(state, nodeIndent) {
   ch = state.input.charCodeAt(state.position);
 
   while (ch !== 0) {
+    if (state.firstTabInLine !== -1) {
+      state.position = state.firstTabInLine;
+      throwError(state, 'tab characters must not be used in indentation');
+    }
 
     if (ch !== 0x2D/* - */) {
       break;
@@ -2060,11 +2121,13 @@ function readBlockMapping(state, nodeIndent, flowIndent) {
   var following,
       allowCompact,
       _line,
-      _pos,
+      _keyLine,
+      _keyLineStart,
+      _keyPos,
       _tag          = state.tag,
       _anchor       = state.anchor,
       _result       = {},
-      overridableKeys = {},
+      overridableKeys = Object.create(null),
       keyTag        = null,
       keyNode       = null,
       valueNode     = null,
@@ -2072,6 +2135,10 @@ function readBlockMapping(state, nodeIndent, flowIndent) {
       detected      = false,
       ch;
 
+  // there is a leading tab before this token, so it can't be a block sequence/mapping;
+  // it can still be flow sequence/mapping or a scalar
+  if (state.firstTabInLine !== -1) return false;
+
   if (state.anchor !== null) {
     state.anchorMap[state.anchor] = _result;
   }
@@ -2079,9 +2146,13 @@ function readBlockMapping(state, nodeIndent, flowIndent) {
   ch = state.input.charCodeAt(state.position);
 
   while (ch !== 0) {
+    if (!atExplicitKey && state.firstTabInLine !== -1) {
+      state.position = state.firstTabInLine;
+      throwError(state, 'tab characters must not be used in indentation');
+    }
+
     following = state.input.charCodeAt(state.position + 1);
     _line = state.line; // Save the current line.
-    _pos = state.position;
 
     //
     // Explicit notation case. There are two separate blocks:
@@ -2091,7 +2162,7 @@ function readBlockMapping(state, nodeIndent, flowIndent) {
 
       if (ch === 0x3F/* ? */) {
         if (atExplicitKey) {
-          storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null);
+          storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null, _keyLine, _keyLineStart, _keyPos);
           keyTag = keyNode = valueNode = null;
         }
 
@@ -2114,7 +2185,16 @@ function readBlockMapping(state, nodeIndent, flowIndent) {
     //
     // Implicit notation case. Flow-style node as the key first, then ":", and the value.
     //
-    } else if (composeNode(state, flowIndent, CONTEXT_FLOW_OUT, false, true)) {
+    } else {
+      _keyLine = state.line;
+      _keyLineStart = state.lineStart;
+      _keyPos = state.position;
+
+      if (!composeNode(state, flowIndent, CONTEXT_FLOW_OUT, false, true)) {
+        // Neither implicit nor explicit notation.
+        // Reading is done. Go to the epilogue.
+        break;
+      }
 
       if (state.line === _line) {
         ch = state.input.charCodeAt(state.position);
@@ -2131,7 +2211,7 @@ function readBlockMapping(state, nodeIndent, flowIndent) {
           }
 
           if (atExplicitKey) {
-            storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null);
+            storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null, _keyLine, _keyLineStart, _keyPos);
             keyTag = keyNode = valueNode = null;
           }
 
@@ -2158,15 +2238,18 @@ function readBlockMapping(state, nodeIndent, flowIndent) {
         state.anchor = _anchor;
         return true; // Keep the result of `composeNode`.
       }
-
-    } else {
-      break; // Reading is done. Go to the epilogue.
     }
 
     //
     // Common reading code for both explicit and implicit notations.
     //
     if (state.line === _line || state.lineIndent > nodeIndent) {
+      if (atExplicitKey) {
+        _keyLine = state.line;
+        _keyLineStart = state.lineStart;
+        _keyPos = state.position;
+      }
+
       if (composeNode(state, nodeIndent, CONTEXT_BLOCK_OUT, true, allowCompact)) {
         if (atExplicitKey) {
           keyNode = state.result;
@@ -2176,7 +2259,7 @@ function readBlockMapping(state, nodeIndent, flowIndent) {
       }
 
       if (!atExplicitKey) {
-        storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode, _line, _pos);
+        storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode, _keyLine, _keyLineStart, _keyPos);
         keyTag = keyNode = valueNode = null;
       }
 
@@ -2184,7 +2267,7 @@ function readBlockMapping(state, nodeIndent, flowIndent) {
       ch = state.input.charCodeAt(state.position);
     }
 
-    if (state.lineIndent > nodeIndent && (ch !== 0)) {
+    if ((state.line === _line || state.lineIndent > nodeIndent) && (ch !== 0)) {
       throwError(state, 'bad indentation of a mapping entry');
     } else if (state.lineIndent < nodeIndent) {
       break;
@@ -2197,7 +2280,7 @@ function readBlockMapping(state, nodeIndent, flowIndent) {
 
   // Special case: last mapping's node contains only the key in explicit notation.
   if (atExplicitKey) {
-    storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null);
+    storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null, _keyLine, _keyLineStart, _keyPos);
   }
 
   // Expose the resulting mapping.
@@ -2286,6 +2369,12 @@ function readTagProperty(state) {
     throwError(state, 'tag name cannot contain such characters: ' + tagName);
   }
 
+  try {
+    tagName = decodeURIComponent(tagName);
+  } catch (err) {
+    throwError(state, 'tag name is malformed: ' + tagName);
+  }
+
   if (isVerbatim) {
     state.tag = tagName;
 
@@ -2353,7 +2442,7 @@ function readAlias(state) {
 
   alias = state.input.slice(_position, state.position);
 
-  if (!state.anchorMap.hasOwnProperty(alias)) {
+  if (!_hasOwnProperty$2.call(state.anchorMap, alias)) {
     throwError(state, 'unidentified alias "' + alias + '"');
   }
 
@@ -2371,6 +2460,7 @@ function composeNode(state, parentIndent, nodeContext, allowToSeek, allowCompact
       hasContent = false,
       typeIndex,
       typeQuantity,
+      typeList,
       type,
       flowIndent,
       blockIndent;
@@ -2472,48 +2562,66 @@ function composeNode(state, parentIndent, nodeContext, allowToSeek, allowCompact
     }
   }
 
-  if (state.tag !== null && state.tag !== '!') {
-    if (state.tag === '?') {
-      // Implicit resolving is not allowed for non-scalar types, and '?'
-      // non-specific tag is only automatically assigned to plain scalars.
-      //
-      // We only need to check kind conformity in case user explicitly assigns '?'
-      // tag, for example like this: "!<?> [0]"
-      //
-      if (state.result !== null && state.kind !== 'scalar') {
-        throwError(state, 'unacceptable node kind for !<?> tag; it should be "scalar", not "' + state.kind + '"');
-      }
-
-      for (typeIndex = 0, typeQuantity = state.implicitTypes.length; typeIndex < typeQuantity; typeIndex += 1) {
-        type = state.implicitTypes[typeIndex];
+  if (state.tag === null) {
+    if (state.anchor !== null) {
+      state.anchorMap[state.anchor] = state.result;
+    }
 
-        if (type.resolve(state.result)) { // `state.result` updated in resolver if matched
-          state.result = type.construct(state.result);
-          state.tag = type.tag;
-          if (state.anchor !== null) {
-            state.anchorMap[state.anchor] = state.result;
-          }
-          break;
-        }
-      }
-    } else if (_hasOwnProperty$2.call(state.typeMap[state.kind || 'fallback'], state.tag)) {
-      type = state.typeMap[state.kind || 'fallback'][state.tag];
+  } else if (state.tag === '?') {
+    // Implicit resolving is not allowed for non-scalar types, and '?'
+    // non-specific tag is only automatically assigned to plain scalars.
+    //
+    // We only need to check kind conformity in case user explicitly assigns '?'
+    // tag, for example like this: "!<?> [0]"
+    //
+    if (state.result !== null && state.kind !== 'scalar') {
+      throwError(state, 'unacceptable node kind for !<?> tag; it should be "scalar", not "' + state.kind + '"');
+    }
 
-      if (state.result !== null && type.kind !== state.kind) {
-        throwError(state, 'unacceptable node kind for !<' + state.tag + '> tag; it should be "' + type.kind + '", not "' + state.kind + '"');
-      }
+    for (typeIndex = 0, typeQuantity = state.implicitTypes.length; typeIndex < typeQuantity; typeIndex += 1) {
+      type = state.implicitTypes[typeIndex];
 
-      if (!type.resolve(state.result)) { // `state.result` updated in resolver if matched
-        throwError(state, 'cannot resolve a node with !<' + state.tag + '> explicit tag');
-      } else {
+      if (type.resolve(state.result)) { // `state.result` updated in resolver if matched
         state.result = type.construct(state.result);
+        state.tag = type.tag;
         if (state.anchor !== null) {
           state.anchorMap[state.anchor] = state.result;
         }
+        break;
       }
+    }
+  } else if (state.tag !== '!') {
+    if (_hasOwnProperty$2.call(state.typeMap[state.kind || 'fallback'], state.tag)) {
+      type = state.typeMap[state.kind || 'fallback'][state.tag];
     } else {
+      // looking for multi type
+      type = null;
+      typeList = state.typeMap.multi[state.kind || 'fallback'];
+
+      for (typeIndex = 0, typeQuantity = typeList.length; typeIndex < typeQuantity; typeIndex += 1) {
+        if (state.tag.slice(0, typeList[typeIndex].tag.length) === typeList[typeIndex].tag) {
+          type = typeList[typeIndex];
+          break;
+        }
+      }
+    }
+
+    if (!type) {
       throwError(state, 'unknown tag !<' + state.tag + '>');
     }
+
+    if (state.result !== null && type.kind !== state.kind) {
+      throwError(state, 'unacceptable node kind for !<' + state.tag + '> tag; it should be "' + type.kind + '", not "' + state.kind + '"');
+    }
+
+    if (!type.resolve(state.result, state.tag)) { // `state.result` updated in resolver if matched
+      throwError(state, 'cannot resolve a node with !<' + state.tag + '> explicit tag');
+    } else {
+      state.result = type.construct(state.result, state.tag);
+      if (state.anchor !== null) {
+        state.anchorMap[state.anchor] = state.result;
+      }
+    }
   }
 
   if (state.listener !== null) {
@@ -2532,8 +2640,8 @@ function readDocument(state) {
 
   state.version = null;
   state.checkLineBreaks = state.legacy;
-  state.tagMap = {};
-  state.anchorMap = {};
+  state.tagMap = Object.create(null);
+  state.anchorMap = Object.create(null);
 
   while ((ch = state.input.charCodeAt(state.position)) !== 0) {
     skipSeparationSpace(state, true, -1);
@@ -2721,6 +2829,7 @@ var loader = {
 var _toString$2       = Object.prototype.toString;
 var _hasOwnProperty$3 = Object.prototype.hasOwnProperty;
 
+var CHAR_BOM                  = 0xFEFF;
 var CHAR_TAB                  = 0x09; /* Tab */
 var CHAR_LINE_FEED            = 0x0A; /* LF */
 var CHAR_CARRIAGE_RETURN      = 0x0D; /* CR */
@@ -2769,6 +2878,8 @@ var DEPRECATED_BOOLEANS_SYNTAX = [
   'n', 'N', 'no', 'No', 'NO', 'off', 'Off', 'OFF'
 ];
 
+var DEPRECATED_BASE60_SYNTAX = /^[-+]?[0-9_]+(?::[0-9_]+)+(?:\.[0-9_]*)?$/;
+
 function compileStyleMap(schema, map) {
   var result, keys, index, length, tag, style, type;
 
@@ -2817,6 +2928,10 @@ function encodeHex(character) {
   return '\\' + handle + common.repeat('0', length - string.length) + string;
 }
 
+
+var QUOTING_TYPE_SINGLE = 1,
+    QUOTING_TYPE_DOUBLE = 2;
+
 function State$1(options) {
   this.schema        = options['schema'] || _default;
   this.indent        = Math.max(1, (options['indent'] || 2));
@@ -2829,6 +2944,9 @@ function State$1(options) {
   this.noRefs        = options['noRefs'] || false;
   this.noCompatMode  = options['noCompatMode'] || false;
   this.condenseFlow  = options['condenseFlow'] || false;
+  this.quotingType   = options['quotingType'] === '"' ? QUOTING_TYPE_DOUBLE : QUOTING_TYPE_SINGLE;
+  this.forceQuotes   = options['forceQuotes'] || false;
+  this.replacer      = typeof options['replacer'] === 'function' ? options['replacer'] : null;
 
   this.implicitTypes = this.schema.compiledImplicit;
   this.explicitTypes = this.schema.compiledExplicit;
@@ -2897,47 +3015,60 @@ function isWhitespace(c) {
 function isPrintable(c) {
   return  (0x00020 <= c && c <= 0x00007E)
       || ((0x000A1 <= c && c <= 0x00D7FF) && c !== 0x2028 && c !== 0x2029)
-      || ((0x0E000 <= c && c <= 0x00FFFD) && c !== 0xFEFF /* BOM */)
+      || ((0x0E000 <= c && c <= 0x00FFFD) && c !== CHAR_BOM)
       ||  (0x10000 <= c && c <= 0x10FFFF);
 }
 
 // [34] ns-char ::= nb-char - s-white
 // [27] nb-char ::= c-printable - b-char - c-byte-order-mark
 // [26] b-char  ::= b-line-feed | b-carriage-return
-// [24] b-line-feed       ::=     #xA    /* LF */
-// [25] b-carriage-return ::=     #xD    /* CR */
-// [3]  c-byte-order-mark ::=     #xFEFF
-function isNsChar(c) {
-  return isPrintable(c) && !isWhitespace(c)
-    // byte-order-mark
-    && c !== 0xFEFF
-    // b-char
+// Including s-white (for some reason, examples doesn't match specs in this aspect)
+// ns-char ::= c-printable - b-line-feed - b-carriage-return - c-byte-order-mark
+function isNsCharOrWhitespace(c) {
+  return isPrintable(c)
+    && c !== CHAR_BOM
+    // - b-char
     && c !== CHAR_CARRIAGE_RETURN
     && c !== CHAR_LINE_FEED;
 }
 
-// Simplified test for values allowed after the first character in plain style.
-function isPlainSafe(c, prev) {
-  // Uses a subset of nb-char - c-flow-indicator - ":" - "#"
-  // where nb-char ::= c-printable - b-char - c-byte-order-mark.
-  return isPrintable(c) && c !== 0xFEFF
-    // - c-flow-indicator
-    && c !== CHAR_COMMA
-    && c !== CHAR_LEFT_SQUARE_BRACKET
-    && c !== CHAR_RIGHT_SQUARE_BRACKET
-    && c !== CHAR_LEFT_CURLY_BRACKET
-    && c !== CHAR_RIGHT_CURLY_BRACKET
-    // - ":" - "#"
-    // /* An ns-char preceding */ "#"
-    && c !== CHAR_COLON
-    && ((c !== CHAR_SHARP) || (prev && isNsChar(prev)));
+// [127]  ns-plain-safe(c) ::= c = flow-out  ⇒ ns-plain-safe-out
+//                             c = flow-in   ⇒ ns-plain-safe-in
+//                             c = block-key ⇒ ns-plain-safe-out
+//                             c = flow-key  ⇒ ns-plain-safe-in
+// [128] ns-plain-safe-out ::= ns-char
+// [129]  ns-plain-safe-in ::= ns-char - c-flow-indicator
+// [130]  ns-plain-char(c) ::=  ( ns-plain-safe(c) - “:” - “#” )
+//                            | ( /* An ns-char preceding */ “#” )
+//                            | ( “:” /* Followed by an ns-plain-safe(c) */ )
+function isPlainSafe(c, prev, inblock) {
+  var cIsNsCharOrWhitespace = isNsCharOrWhitespace(c);
+  var cIsNsChar = cIsNsCharOrWhitespace && !isWhitespace(c);
+  return (
+    // ns-plain-safe
+    inblock ? // c = flow-in
+      cIsNsCharOrWhitespace
+      : cIsNsCharOrWhitespace
+        // - c-flow-indicator
+        && c !== CHAR_COMMA
+        && c !== CHAR_LEFT_SQUARE_BRACKET
+        && c !== CHAR_RIGHT_SQUARE_BRACKET
+        && c !== CHAR_LEFT_CURLY_BRACKET
+        && c !== CHAR_RIGHT_CURLY_BRACKET
+  )
+    // ns-plain-char
+    && c !== CHAR_SHARP // false on '#'
+    && !(prev === CHAR_COLON && !cIsNsChar) // false on ': '
+    || (isNsCharOrWhitespace(prev) && !isWhitespace(prev) && c === CHAR_SHARP) // change to true on '[^ ]#'
+    || (prev === CHAR_COLON && cIsNsChar); // change to true on ':[^ ]'
 }
 
 // Simplified test for values allowed as the first character in plain style.
 function isPlainSafeFirst(c) {
   // Uses a subset of ns-char - c-indicator
   // where ns-char = nb-char - s-white.
-  return isPrintable(c) && c !== 0xFEFF
+  // No support of ( ( “?” | “:” | “-” ) /* Followed by an ns-plain-safe(c)) */ ) part
+  return isPrintable(c) && c !== CHAR_BOM
     && !isWhitespace(c) // - s-white
     // - (c-indicator ::=
     // “-” | “?” | “:” | “,” | “[” | “]” | “{” | “}”
@@ -2965,6 +3096,12 @@ function isPlainSafeFirst(c) {
     && c !== CHAR_GRAVE_ACCENT;
 }
 
+// Simplified test for values allowed as the last character in plain style.
+function isPlainSafeLast(c) {
+  // just not whitespace or colon, it will be checked to be plain character later
+  return !isWhitespace(c) && c !== CHAR_COLON;
+}
+
 // Same as 'string'.codePointAt(pos), but works in older browsers.
 function codePointAt(string, pos) {
   var first = string.charCodeAt(pos), second;
@@ -2997,7 +3134,9 @@ var STYLE_PLAIN   = 1,
 //    STYLE_PLAIN or STYLE_SINGLE => no \n are in the string.
 //    STYLE_LITERAL => no lines are suitable for folding (or lineWidth is -1).
 //    STYLE_FOLDED => a line > lineWidth and can be folded (and lineWidth != -1).
-function chooseScalarStyle(string, singleLineOnly, indentPerLevel, lineWidth, testAmbiguousType) {
+function chooseScalarStyle(string, singleLineOnly, indentPerLevel, lineWidth,
+  testAmbiguousType, quotingType, forceQuotes, inblock) {
+
   var i;
   var char = 0;
   var prevChar = null;
@@ -3006,9 +3145,9 @@ function chooseScalarStyle(string, singleLineOnly, indentPerLevel, lineWidth, te
   var shouldTrackWidth = lineWidth !== -1;
   var previousLineBreak = -1; // count the first line correctly
   var plain = isPlainSafeFirst(codePointAt(string, 0))
-          && !isWhitespace(codePointAt(string, string.length - 1));
+          && isPlainSafeLast(codePointAt(string, string.length - 1));
 
-  if (singleLineOnly) {
+  if (singleLineOnly || forceQuotes) {
     // Case: no block styles.
     // Check for disallowed characters to rule out plain and single.
     for (i = 0; i < string.length; char >= 0x10000 ? i += 2 : i++) {
@@ -3016,7 +3155,7 @@ function chooseScalarStyle(string, singleLineOnly, indentPerLevel, lineWidth, te
       if (!isPrintable(char)) {
         return STYLE_DOUBLE;
       }
-      plain = plain && isPlainSafe(char, prevChar);
+      plain = plain && isPlainSafe(char, prevChar, inblock);
       prevChar = char;
     }
   } else {
@@ -3036,7 +3175,7 @@ function chooseScalarStyle(string, singleLineOnly, indentPerLevel, lineWidth, te
       } else if (!isPrintable(char)) {
         return STYLE_DOUBLE;
       }
-      plain = plain && isPlainSafe(char, prevChar);
+      plain = plain && isPlainSafe(char, prevChar, inblock);
       prevChar = char;
     }
     // in case the end is missing a \n
@@ -3050,8 +3189,10 @@ function chooseScalarStyle(string, singleLineOnly, indentPerLevel, lineWidth, te
   if (!hasLineBreak && !hasFoldableLine) {
     // Strings interpretable as another type have to be quoted;
     // e.g. the string 'true' vs. the boolean true.
-    return plain && !testAmbiguousType(string)
-      ? STYLE_PLAIN : STYLE_SINGLE;
+    if (plain && !forceQuotes && !testAmbiguousType(string)) {
+      return STYLE_PLAIN;
+    }
+    return quotingType === QUOTING_TYPE_DOUBLE ? STYLE_DOUBLE : STYLE_SINGLE;
   }
   // Edge case: block indentation indicator can only have one digit.
   if (indentPerLevel > 9 && needIndentIndicator(string)) {
@@ -3059,7 +3200,10 @@ function chooseScalarStyle(string, singleLineOnly, indentPerLevel, lineWidth, te
   }
   // At this point we know block styles are valid.
   // Prefer literal style unless we want to fold.
-  return hasFoldableLine ? STYLE_FOLDED : STYLE_LITERAL;
+  if (!forceQuotes) {
+    return hasFoldableLine ? STYLE_FOLDED : STYLE_LITERAL;
+  }
+  return quotingType === QUOTING_TYPE_DOUBLE ? STYLE_DOUBLE : STYLE_SINGLE;
 }
 
 // Note: line breaking/folding is implemented for only the folded style.
@@ -3068,14 +3212,15 @@ function chooseScalarStyle(string, singleLineOnly, indentPerLevel, lineWidth, te
 //    • No ending newline => unaffected; already using strip "-" chomping.
 //    • Ending newline    => removed then restored.
 //  Importantly, this keeps the "+" chomp indicator from gaining an extra line.
-function writeScalar(state, string, level, iskey) {
+function writeScalar(state, string, level, iskey, inblock) {
   state.dump = (function () {
     if (string.length === 0) {
-      return "''";
+      return state.quotingType === QUOTING_TYPE_DOUBLE ? '""' : "''";
     }
-    if (!state.noCompatMode &&
-        DEPRECATED_BOOLEANS_SYNTAX.indexOf(string) !== -1) {
-      return "'" + string + "'";
+    if (!state.noCompatMode) {
+      if (DEPRECATED_BOOLEANS_SYNTAX.indexOf(string) !== -1 || DEPRECATED_BASE60_SYNTAX.test(string)) {
+        return state.quotingType === QUOTING_TYPE_DOUBLE ? ('"' + string + '"') : ("'" + string + "'");
+      }
     }
 
     var indent = state.indent * Math.max(1, level); // no 0-indent scalars
@@ -3097,7 +3242,9 @@ function writeScalar(state, string, level, iskey) {
       return testImplicitResolving(state, string);
     }
 
-    switch (chooseScalarStyle(string, singleLineOnly, state.indent, lineWidth, testAmbiguity)) {
+    switch (chooseScalarStyle(string, singleLineOnly, state.indent, lineWidth,
+      testAmbiguity, state.quotingType, state.forceQuotes && !iskey, inblock)) {
+
       case STYLE_PLAIN:
         return string;
       case STYLE_SINGLE:
@@ -3236,12 +3383,22 @@ function writeFlowSequence(state, level, object) {
   var _result = '',
       _tag    = state.tag,
       index,
-      length;
+      length,
+      value;
 
   for (index = 0, length = object.length; index < length; index += 1) {
-    // Write only valid elements.
-    if (writeNode(state, level, object[index], false, false)) {
-      if (index !== 0) _result += ',' + (!state.condenseFlow ? ' ' : '');
+    value = object[index];
+
+    if (state.replacer) {
+      value = state.replacer.call(object, String(index), value);
+    }
+
+    // Write only valid elements, put null instead of invalid elements.
+    if (writeNode(state, level, value, false, false) ||
+        (typeof value === 'undefined' &&
+         writeNode(state, level, null, false, false))) {
+
+      if (_result !== '') _result += ',' + (!state.condenseFlow ? ' ' : '');
       _result += state.dump;
     }
   }
@@ -3254,12 +3411,22 @@ function writeBlockSequence(state, level, object, compact) {
   var _result = '',
       _tag    = state.tag,
       index,
-      length;
+      length,
+      value;
 
   for (index = 0, length = object.length; index < length; index += 1) {
-    // Write only valid elements.
-    if (writeNode(state, level + 1, object[index], true, true, false, true)) {
-      if (!compact || index !== 0) {
+    value = object[index];
+
+    if (state.replacer) {
+      value = state.replacer.call(object, String(index), value);
+    }
+
+    // Write only valid elements, put null instead of invalid elements.
+    if (writeNode(state, level + 1, value, true, true, false, true) ||
+        (typeof value === 'undefined' &&
+         writeNode(state, level + 1, null, true, true, false, true))) {
+
+      if (!compact || _result !== '') {
         _result += generateNextLine(state, level);
       }
 
@@ -3290,13 +3457,17 @@ function writeFlowMapping(state, level, object) {
   for (index = 0, length = objectKeyList.length; index < length; index += 1) {
 
     pairBuffer = '';
-    if (index !== 0) pairBuffer += ', ';
+    if (_result !== '') pairBuffer += ', ';
 
     if (state.condenseFlow) pairBuffer += '"';
 
     objectKey = objectKeyList[index];
     objectValue = object[objectKey];
 
+    if (state.replacer) {
+      objectValue = state.replacer.call(object, objectKey, objectValue);
+    }
+
     if (!writeNode(state, level, objectKey, false, false)) {
       continue; // Skip this pair because of invalid key;
     }
@@ -3345,13 +3516,17 @@ function writeBlockMapping(state, level, object, compact) {
   for (index = 0, length = objectKeyList.length; index < length; index += 1) {
     pairBuffer = '';
 
-    if (!compact || index !== 0) {
+    if (!compact || _result !== '') {
       pairBuffer += generateNextLine(state, level);
     }
 
     objectKey = objectKeyList[index];
     objectValue = object[objectKey];
 
+    if (state.replacer) {
+      objectValue = state.replacer.call(object, objectKey, objectValue);
+    }
+
     if (!writeNode(state, level + 1, objectKey, true, true, true)) {
       continue; // Skip this pair because of invalid key.
     }
@@ -3405,7 +3580,15 @@ function detectType(state, object, explicit) {
         (!type.instanceOf || ((typeof object === 'object') && (object instanceof type.instanceOf))) &&
         (!type.predicate  || type.predicate(object))) {
 
-      state.tag = explicit ? type.tag : '?';
+      if (explicit) {
+        if (type.multi && type.representName) {
+          state.tag = type.representName(object);
+        } else {
+          state.tag = type.tag;
+        }
+      } else {
+        state.tag = '?';
+      }
 
       if (type.represent) {
         style = state.styleMap[type.tag] || type.defaultStyle;
@@ -3440,6 +3623,8 @@ function writeNode(state, level, object, block, compact, iskey, isblockseq) {
   }
 
   var type = _toString$2.call(state.dump);
+  var inblock = block;
+  var tagStr;
 
   if (block) {
     block = (state.flowLevel < 0 || state.flowLevel > level);
@@ -3494,15 +3679,42 @@ function writeNode(state, level, object, block, compact, iskey, isblockseq) {
       }
     } else if (type === '[object String]') {
       if (state.tag !== '?') {
-        writeScalar(state, state.dump, level, iskey);
+        writeScalar(state, state.dump, level, iskey, inblock);
       }
+    } else if (type === '[object Undefined]') {
+      return false;
     } else {
       if (state.skipInvalid) return false;
       throw new exception('unacceptable kind of an object to dump ' + type);
     }
 
     if (state.tag !== null && state.tag !== '?') {
-      state.dump = '!<' + state.tag + '> ' + state.dump;
+      // Need to encode all characters except those allowed by the spec:
+      //
+      // [35] ns-dec-digit    ::=  [#x30-#x39] /* 0-9 */
+      // [36] ns-hex-digit    ::=  ns-dec-digit
+      //                         | [#x41-#x46] /* A-F */ | [#x61-#x66] /* a-f */
+      // [37] ns-ascii-letter ::=  [#x41-#x5A] /* A-Z */ | [#x61-#x7A] /* a-z */
+      // [38] ns-word-char    ::=  ns-dec-digit | ns-ascii-letter | “-”
+      // [39] ns-uri-char     ::=  “%” ns-hex-digit ns-hex-digit | ns-word-char | “#”
+      //                         | “;” | “/” | “?” | “:” | “@” | “&” | “=” | “+” | “$” | “,”
+      //                         | “_” | “.” | “!” | “~” | “*” | “'” | “(” | “)” | “[” | “]”
+      //
+      // Also need to encode '!' because it has special meaning (end of tag prefix).
+      //
+      tagStr = encodeURI(
+        state.tag[0] === '!' ? state.tag.slice(1) : state.tag
+      ).replace(/!/g, '%21');
+
+      if (state.tag[0] === '!') {
+        tagStr = '!' + tagStr;
+      } else if (tagStr.slice(0, 18) === 'tag:yaml.org,2002:') {
+        tagStr = '!!' + tagStr.slice(18);
+      } else {
+        tagStr = '!<' + tagStr + '>';
+      }
+
+      state.dump = tagStr + ' ' + state.dump;
     }
   }
 
@@ -3559,7 +3771,13 @@ function dump(input, options) {
 
   if (!state.noRefs) getDuplicateReferences(input, state);
 
-  if (writeNode(state, 0, input, true, true)) return state.dump + '\n';
+  var value = input;
+
+  if (state.replacer) {
+    value = state.replacer.call({ '': value }, '', value);
+  }
+
+  if (writeNode(state, 0, value, true, true)) return state.dump + '\n';
 
   return '';
 }