[issue13903] New shared-keys dictionary implementation

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

This patch integrates the dictkeys' refcounting into the refcount checking framework. Seems to work ok, but it would be better if someone more acquainted with the code could confirm it.

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Added file: http://bugs.python.org/file25385/dkdebug.patch

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