[issue4804] Python on Windows disables all C runtime library assertions

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

> Martin, your reproducable behaviour involves consistently disabling 
> functionality that those threads you mention may rely on

Right. So with the current implementation, they notice immediately that
something is wrong.

> (and since 
> this i is a global state that no one messes with, they are unlikely to 
> be doing so)

Except that Python messes with it, so in the small window where the
assertions get disabled, they may run past them

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