[mypyc] Fix unsafe borrowing of instance attributes with free-threading#21688
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p-sawicki
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Jul 7, 2026
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Don't borrow native attributes any more, except for final native attributes (these can't be rebound, so they are safe to borrow), and attributes with
vectypes (vecrequires explicit synchronization by design).Work on mypyc/mypyc#1203.
I used coding agent assist for this, but manually reviewed changes.