[issue22854] Documentation/implementation out of sync for IO

[Roundup Robot]

Roundup Robot added the comment:

New changeset dc9e5f09ac0c by Martin Panter in branch '3.5':
Issue #22854: Clarify documentation about UnsupportedOperation and add tests
https://hg.python.org/cpython/rev/dc9e5f09ac0c

New changeset c27e9dcad1a3 by Martin Panter in branch 'default':
Issue #22854: Merge UnsupportedOperation fixes from 3.5
https://hg.python.org/cpython/rev/c27e9dcad1a3

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nosy: +python-dev

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