Fix use-after-free when re-initializing Set#214
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Picked up by fuzzing the gem with Ruzzy, prevent re-initialization of a Set to avoid a use-after-free when repeatedly calling match on an uncompiled Set while re-initializing it.
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Picked up by fuzzing the gem with Ruzzy, prevent re-initialization of a Set to avoid a use-after-free when repeatedly calling match on an uncompiled Set while re-initializing it.