Use JSON semantics for equality and contains - #109
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This fixes equality to use JSON-style semantics, including one numeric type and recursive structural comparison without object key-order sensitivity. contains() now uses the same comparator for arrays and returns false, not null, when a string subject is searched with a non-string value. Empty arrays and empty objects still compare equal because PHP cannot distinguish them after associative JSON decoding, and numeric-string-keyed object behavior remains unchanged.