[issue39590] collections.deque.__contains__ and .count should hold strong references.

[Dennis Sweeney]

Change by Dennis Sweeney <sweeney.dennis650 at gmail.com>:


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keywords: +patch
pull_requests: +17796
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/18421

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39590>
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