[issue41689] allow __text_signature__ to work for c heap types

[Benjamin Peterson]

Change by Benjamin Peterson <benjamin at python.org>:


----------
keywords: +patch
pull_requests: +21149
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/22058

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41689>
_______________________________________