[pull] master from ruby:master - #1427
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With more than 31 keyword arguments, tracking unevaluated defaults uses an integer-keyed Hash whose collisions can invoke methods when `Integer#==` is refined or redefined, corrupting argument locals above `cfp->sp`. Use identity hashes to prevent these calls during argument setup and `checkkeyword` execution. Making `rb_any_cmp` compare special constants directly would also bypass redefined `eql?` methods in ordinary hashes. Limit identity comparison to the internal keyword tracking hashes to preserve that behavior for now.
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