> * **FIXED**: `MultiKeyMap` nested Set lookup bug in COLLECTIONS_EXPANDED mode - Fixed size mismatch false negatives when looking up keys containing expanded Collections. In COLLECTIONS_EXPANDED mode, stored keys have expanded size (includes SET_OPEN/SET_CLOSE markers) while lookup keys have un-expanded Collection size. Added skipSizeCheck logic to bypass size comparison for Collection-to-Collection matches in expanded mode, allowing compareCollections() to handle the structural comparison correctly. This fixes lookups failing incorrectly when using nested Sets or Collections as multi-keys.
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