Github user afds commented on the pull request: https://github.com/apache/thrift/pull/627#issuecomment-143589859 I'm perfectly fine to make it default. Theoretically possible issues is that someone heavily relies on HashMap/HashSet or uses _null_ keys/elements (EnumMap/EnumSet does not allow _null_ keys/elements). But in that case, we indeed, need to make it default to punish them.
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