[issue26765] Factor out common bytes and bytearray implementation

[Roundup Robot]

Roundup Robot added the comment:

New changeset 6c4c0a23fabb by Serhiy Storchaka in branch 'default':
Backed out changeset b0087e17cd5e (issue #26765)
https://hg.python.org/cpython/rev/6c4c0a23fabb

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