[issue21667] Clarify status of O(1) indexing semantics of str objects

[Roundup Robot]

Roundup Robot added the comment:

New changeset 6ffb6909c439 by Nick Coghlan in branch '3.4':
Issue #21667: Clarify string data model description
http://hg.python.org/cpython/rev/6ffb6909c439

New changeset 7c120e77d6f7 by Nick Coghlan in branch 'default':
Merge issue #21667 from 3.4
http://hg.python.org/cpython/rev/7c120e77d6f7

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nosy: +python-dev

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