So I think it's probably a case of the mingw C runtime having only recently "caught up to" (and synced with) something that has been present in Microsoft's C runtime for quite a while.

I think they changed compiler and in the process changed from one MS runtime (MSVCRT) to a new one MS runtime (UCRT). See my other comment.

In reply to Re^3: [Win32] Weird behavioural change between 5.38.0 and 5.40.0 by ikegami
in thread [Win32] Weird behavioural change between 5.38.0 and 5.40.0 by syphilis

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