Merge branch '3.4' into 4.4

* 3.4:
  [Phpunit] Fix running skipped tests expecting only deprecations
  [DependencyInjection] #35505 Fix typo in test name
  [Yaml][Inline] Fail properly on empty object tag and empty const tag
  Check non-null type for numeric type
  Check value isset to avoid PHP notice
  bug symfony#28179 [DomCrawler] Skip disabled fields processing in Form

Inline.php

@@ -589,6 +589,10 @@ private static function evaluateScalar(string $scalar, int $flags, array $refere
                         return substr($scalar, 2);
                     case 0 === strpos($scalar, '!php/object'):
                         if (self::$objectSupport) {
+                            if (!isset($scalar[12])) {
+                                return false;
+                            }
+
                             return unserialize(self::parseScalar(substr($scalar, 12)));
                         }
 
@@ -599,6 +603,10 @@ private static function evaluateScalar(string $scalar, int $flags, array $refere
                         return null;
                     case 0 === strpos($scalar, '!php/const'):
                         if (self::$constantSupport) {
+                            if (!isset($scalar[11])) {
+                                return '';
+                            }
+
                             $i = 0;
                             if (\defined($const = self::parseScalar(substr($scalar, 11), 0, null, $i, false))) {
                                 return \constant($const);

Tests/InlineTest.php

@@ -738,6 +738,49 @@ public function getTestsForOctalNumbers()
         ];
     }
 
+    /**
+     * @dataProvider phpObjectTagWithEmptyValueProvider
+     */
+    public function testPhpObjectWithEmptyValue($expected, $value)
+    {
+        $this->assertSame($expected, Inline::parse($value, Yaml::PARSE_OBJECT));
+    }
+
+    public function phpObjectTagWithEmptyValueProvider()
+    {
+        return [
+            [false, '!php/object'],
+            [false, '!php/object '],
+            [false, '!php/object  '],
+            [[false], '[!php/object]'],
+            [[false], '[!php/object ]'],
+            [[false, 'foo'], '[!php/object  , foo]'],
+        ];
+    }
+
+    /**
+     * @dataProvider phpConstTagWithEmptyValueProvider
+     */
+    public function testPhpConstTagWithEmptyValue($expected, $value)
+    {
+        $this->assertSame($expected, Inline::parse($value, Yaml::PARSE_CONSTANT));
+    }
+
+    public function phpConstTagWithEmptyValueProvider()
+    {
+        return [
+            ['', '!php/const'],
+            ['', '!php/const '],
+            ['', '!php/const  '],
+            [[''], '[!php/const]'],
+            [[''], '[!php/const ]'],
+            [['', 'foo'], '[!php/const  , foo]'],
+            [['' => 'foo'], '{!php/const: foo}'],
+            [['' => 'foo'], '{!php/const : foo}'],
+            [['' => 'foo', 'bar' => 'ccc'], '{!php/const  : foo, bar: ccc}'],
+        ];
+    }
+
     /**
      * @dataProvider unquotedExclamationMarkThrowsProvider
      */