[issue38891] ShareableList read and write access is O(N), should be O(1)

[Thomas Krennwallner]

Change by Thomas Krennwallner <tk at postsubmeta.net>:


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keywords: +patch
nosy: +tkren
nosy_count: 3.0 -> 4.0
pull_requests: +18343
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/18996

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38891>
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