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Yukihiro "Matz" Matsumoto
9b66ec82c4
Add key existence check using key?() before value access, so that
missing keys correctly fail to match (e.g. {b: 1} no longer matches
{a: nil} pattern). Implement **nil and empty {} exact match via
hash.size == num_keys check. Fix **rest to properly exclude matched
keys using dup + __delete instead of copying the entire hash.
Co-authored-by: Claude <noreply@anthropic.com>