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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