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This change does not affect Comment's field names or types, since that type is used in the NoteDb JSON storage format, so it needs to remain backwards compatible. It's possible we could change this and then use a custom type adapter in Gson, but that may be more effort than it's worth. See Iff5644e2 context on removing RevId usages. Change-Id: If054aca4867f5868e108616e7524b15f5c52de55