[issue24912] The type of cached objects is mutable

[Erlend Egeberg Aasland]

Change by Erlend Egeberg Aasland <erlend.aasland at innova.no>:


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nosy: +erlendaasland
nosy_count: 17.0 -> 18.0
pull_requests: +24435
pull_request: https://github.com/python/cpython/pull/25714

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue24912>
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