[issue5391] mmap: read_byte/write_byte and object type

[Hirokazu Yamamoto]

Hirokazu Yamamoto <ocean-city at m2.ccsnet.ne.jp> added the comment:

Thank for pointing this out. I've looked at bytearray and
bytes implementations, they actually return unsigned value.
I fixed this in r86159(py3k) and r86160(release31-maint).

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