Issue #18716: Deprecate the formatter module
Issue #16803: Run test.test_importlib.test_abc under both
_frozen_importlib and source.
Issue #18594:  Make the C code more closely match the pure python code.
merge
#19166: use an unused var in a test.  Patch by Vajrasky Kok.
#19166: merge with 3.3.
#19148: fix markup errors and wording in enum docs.  Patch by Esa Peuha.
Add missing comma.
[issue 19152] Ensure we have actually registered ExtensionFileLoader as an ExecutionLoader.
[issue 19152] Add versionadded for ExtensionFileLoader.get_filename().