3.49.0
(feat): Optimize schema serialization layer performance with 7.2x geometric mean speedup.
Replace O(n²) array/object spread patterns in list and record builders with O(n) loops,
lazily memoize property metadata in object schemas, simplify prototype chain check,
use for-in loops to avoid Object.entries() allocations, cache required-key Sets,
and eliminate rest spread in union discriminant extraction.
