Heikki Toivonen

gh-143445: Optimize deepcopy for 1.04x speedup

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Gains according to pyperformance: ``` deepcopy: Mean +- std dev: 411 us +- 2 us -> 396 us +- 3 us: 1.04x faster Significant (t=28.94) deepcopy_reduce: Mean +- std dev:...

Optimize copy.deepcopy by converting a generator expression into list comprehension - 1.04x improvement in pyperformance

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# Feature or enhancement ### Proposal: There is a generator expression that is created for `copy.deepcopy` and immediately fully consumed with all the values needed simultaneously, so the generator provides...