[issue12021] mmap.read requires an argument

[Petri Lehtinen]

Petri Lehtinen <petri at digip.org> added the comment:

> I think duplicating it is fine, since the code is probably simple anyway

Added a new patch. I duplicated the None converting logic in _io/_iomodule.c to mmapmodule.c, changed the doc to say "read([n])", and expanded the test cases a bit.

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