Optimise overload consistency checks for large numbers of literal-containing overloads#21218

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pelson:feature/poly-complexity-for-override-checking

Commits on Apr 14, 2026

Pre-compute the signature of each overload before checking via the O(n^2) consistency check. Add a fast-path at the top of the inner loop.
pelson
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Tidy up the loop in check_overlapping_overloads, reducing the None checking by preparing the list of valid items
pelson
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Fix literal fingerprint fast-path incorrectly skipping optional arguments
pelson
committed