diff --git a/music21/common/classTools.py b/music21/common/classTools.py
index 18a8ee8d1d..2c4efd541e 100644
--- a/music21/common/classTools.py
+++ b/music21/common/classTools.py
@@ -40,7 +40,7 @@ def isInt(usrData: t.Any) -> t.TypeGuard[int]:
     return isinstance(usrData, int) and usrData is not True and usrData is not False
 
 
-def isNum(usrData: t.Any) -> t.TypeGuard[Number]:
+def isNum(usrData: t.Any) -> t.TypeGuard[numbers.Number]:
     '''
     check if usrData is a number (float, int, long, Decimal),
     return boolean
@@ -85,7 +85,7 @@ def isNum(usrData: t.Any) -> t.TypeGuard[Number]:
         return False
 
 
-def isListLike(usrData: t.Any) -> bool:
+def isListLike(usrData: t.Any) -> t.TypeGuard[list | tuple]:
     '''
     Returns True if is a List or Tuple or their subclasses.
 
@@ -145,7 +145,7 @@ def isIterable(usrData: t.Any) -> t.TypeGuard[Iterable]:
     return False
 
 
-def holdsType(usrData: t.Any, checkType: type[_T]) -> TypeGuard[Collection[_T]]:
+def holdsType(usrData: t.Any, checkType: type[_T]) -> t.TypeGuard[Collection[_T]]:
     '''
     Returns True if usrData is a Collection of type checkType.
 
diff --git a/music21/musicxml/xmlToM21.py b/music21/musicxml/xmlToM21.py
index 48279fd386..14673afd63 100644
--- a/music21/musicxml/xmlToM21.py
+++ b/music21/musicxml/xmlToM21.py
@@ -4732,7 +4732,7 @@ def xmlBarline(self, mxBarline):
             # not complete
 
             # TODO: this should also filter by number (in theory.)
-            rbSpanners = self.spannerBundle.getByClass('RepeatBracket').getByCompleteStatus(False)
+            rbSpanners = self.spannerBundle.getByClass(spanner.RepeatBracket).getByCompleteStatus(False)
             # if we have no complete bracket objects, must start a new one
             if not rbSpanners:
                 # create with this measure as the object
diff --git a/music21/spanner.py b/music21/spanner.py
index fcf028313d..b6ef7533d3 100644
--- a/music21/spanner.py
+++ b/music21/spanner.py
@@ -1348,7 +1348,6 @@ def _setNumber(self, value: int | str | Iterable[int]):
             # undefined.
             self.numberRange = [0]
         elif common.holdsType(value, int):
-            value = t.cast(Collection[int], value)  # unnecessary, but not working in mypy 0.982
             self.numberRange = []  # clear
             for x in value:
                 self.numberRange.append(x)
@@ -1364,7 +1363,7 @@ def _setNumber(self, value: int | str | Iterable[int]):
                     one_number = int(one_letter_value.strip())
                     self.numberRange.append(one_number)
             elif value.isdigit():
-                self.numberRange.append(int(value))
+                self.numberRange = [int(value)]
             else:
                 raise SpannerException(f'number for RepeatBracket must be a number, not {value!r}')
         elif common.isInt(value):
diff --git a/music21/test/commonTest.py b/music21/test/commonTest.py
index 944467114a..e8f2fb663d 100644
--- a/music21/test/commonTest.py
+++ b/music21/test/commonTest.py
@@ -76,12 +76,12 @@ def load_source(name: str, path: str) -> types.ModuleType:
         raise FileNotFoundError(f'No such file or directory: {path!r}')
     if name in sys.modules:
         module = sys.modules[name]
-        spec.loader.exec_module(module)
     else:
         module = importlib.util.module_from_spec(spec)
         if module is None:
             raise FileNotFoundError(f'No such file or directory: {path!r}')
-        spec.loader.exec_module(module)
+        sys.modules[name] = module
+    spec.loader.exec_module(module)
 
     return module
 
@@ -424,7 +424,7 @@ def getModule(self, fp, restoreEnvironmentDefaults=False):
             with warnings.catch_warnings():
                 mod = load_source(name, fp)
         except Exception as excp:  # pylint: disable=broad-except
-            environLocal.warn(['failed import:', fp, '\n',
+            environLocal.warn(['failed import:', name, '\t', fp, '\n',
                                '\tEXCEPTION:', str(excp).strip()])
             return None