[issue13903] New shared-keys dictionary implementation

[Roundup Robot]

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

New changeset 5d5b72a71898 by Benjamin Peterson in branch 'default':
distiguish between refusing to creating shared keys and error (#13903)
http://hg.python.org/cpython/rev/5d5b72a71898

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