[issue13903] New shared-keys dictionary implementation

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset 34b6998efd2c by Benjamin Peterson in branch 'default':
fix instance dicts with str subclasses (#13903)
http://hg.python.org/cpython/rev/34b6998efd2c

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