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Support unknown fields in the method
Message.clone()
.Extensions are stored as unknown fields on a message, and cloning a message will currently discard any set extension. This behavior is unexpected, since it would be logical that a deep copy includes all properties that were explicitly set, whether it is a regular field, or an extension.
This PR fixes this flaw, and includes unknown fields when cloning a message.
This also documents equal's behavior of ignoring the unknown fields and extensions.