[issue20478] Avoid inadvertently special casing Counter in statistics module

[Roundup Robot]

Roundup Robot added the comment:

New changeset 78d0b7472697 by Nick Coghlan in branch 'default':
Issue #20478: avoid special casing Counter in statistics
http://hg.python.org/cpython/rev/78d0b7472697

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20478>
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