Make shallow copies of lists instead of deep copies #1490
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seratch
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Aug 15, 2025
vcshih
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Aug 15, 2025
We were making deep copies, which is (1) inefficient and (2) causes some pickling errors. Instead, this PR just makes shallow copies, calling list.copy(). We do want a shallow copy so that mutations don't affect the original past-end list.
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We were making deep copies, which is (1) inefficient and (2) causes some pickling errors.
Instead, this PR just makes shallow copies, calling list.copy(). We do want a shallow copy so that mutations don't affect the original past-end list.