[issue23325] Turn SIG_DFL and SIG_IGN into functions

[Ethan Furman]

Ethan Furman added the comment:

Thanks for the explanation, point taken.

However, it seems to me that changing the type of the constants from 'int' to 'function' is backwards incompatible, will break code, and is probably not worth it (and would require a deprecation period if it was worth it).

I still think the better answer is to delve into Modules/signalmodule.c and fix the comparisons.

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