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The reason for the use of two constants is that previously there was comparison in the code with a hardcoded 'f':
 if postdev[0] == 'f':
I think it's a common practice to create constants for such hardcoded values. Also this hit when I was making a patch. I didn't know, that 'f' was used in the code and when I changed _FINAL_MARKER to ('f',), some tests failed. Alternatively to what I did in the patch you can use:
 if postdev[0] == _FINAL_MARKER[0]:
but it just doesn't feel right for me.
Anyway, I can't find packaging package in default branch of python. Where is the development done? I'd be happy to try to provide some more patches for this package, if there is a need for any.