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by jwheare2 3792 days ago
Beyond things like ACTION, CTCP is not widely or consistently supported. This is partly because no one is advancing the specification, and partly because it isn't well specified in the first place. Not to mention the syntactic issues with hacking the payload into IRC's 512 byte limit using invisible meta characters. Metadata and message tags (which support an extra 512 bytes of data) are much more suited to this sort of feature, are better specified, and have more backing from client developers.