[issue16742] PyOS_Readline drops GIL and calls PyOS_StdioReadline, which isn't thread safe

[STINNER Victor]

STINNER Victor added the comment:

> Kristján Valur Jónsson added the comment:
>
> Perhaps in debug builds the memory apis should verify consistency and
matching useage.

Python does check usage of apis in debug mode. Memory allocation failure
are almost never checked. See my pyfailmalloc module for that.

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