[issue34953] Implement `mmap.mmap.__repr__`

[Eric V. Smith]

New submission from Eric V. Smith <eric at trueblade.com>:

What do you propose the repr would look like?

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components: +Interpreter Core -Library (Lib)
nosy: +eric.smith

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34953>
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