[issue32101] Add PYTHONDEVMODE=1 to enable the developer mode

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

Another argument against PYTHONXOPTIONS is that each implementation is free to decide which -X options it wants to support, and we don't really define what they're supposed to do with options they don't recognise.

By contrast, there's an established behaviour for unknown environment variables: implementations that don't support them just ignore them.

So +1 for PYTHONDEVMODE=1 from me - that also gives us more flexibility if we decide to add arguments to the option later.

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