[issue13903] New shared-keys dictionary implementation

[Roundup Robot]

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

New changeset 507a6703d6a3 by Benjamin Peterson in branch 'default':
fix dict gc tracking (#13903)
http://hg.python.org/cpython/rev/507a6703d6a3

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