marshal: improve bytes handling

[sobolevn]

Examples:

>>> import marshal
>>> marshal.loads(b'\xe9{\x00\x00\x00')
123
>>> marshal.loads(bytearray(b'\xe9{\x00\x00\x00'))
123
>>> marshal.loads(memoryview(b'\xe9{\x00\x00\x00'))
123

[hauntsaninja]

Lgtm

[JelleZijlstra]

Suggested change

	from _typeshed import ReadableBuffer
	from _typeshed import ReadableBuffer, SupportsRead, SupportsWrite

[JelleZijlstra]

Oh you just did that, thanks! GitHub's UI doesn't handle this well: the "Commit" button still shows up on the suggestion but clicking it does nothing. :)

[sobolevn]

Already done ;)

[github-actions]

According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉