# Bug report ### Bug description: ~When `typing._caller`'s `sys._getframe` fallback is triggered without `_abc` module, `_typing._allow_reckless_class_checks` fails to check `_py_abc` while running `abc.ABCMeta.__instancecheck__`.~ Without `_abc` module, `_typing._allow_reckless_class_checks`fails to check `_py_abc` Related code in typing.py: https://github.com/python/cpython/blob/v3.14.0b3/Lib/typing.py#L1846-L1863 This is technically a bug of typing.py, but really hard to be triggered on CPython. ### CPython versions tested on: CPython main branch ### Operating systems tested on: macOS # Solution suggestion ## Patch typing._allow_reckless_class_checks to also check `_py_abc` ~This is the most conservative approach. Compatible with all of previous scenarios and additionally fixing the bug.~ ## ~Patch typing._caller to remove sys._getframe or raise warning when fallback~ ~If the the `typing` requires to work with sys._getframemodulename, then let the users to know it has a caveat.~ <!-- gh-linked-prs --> ### Linked PRs * gh-136115 <!-- /gh-linked-prs -->