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For public use, these constants aren't ideally exposed through an SPI like MetadataExtractor, and there isn't any other obvious place either. In practice the only public API where these can be passed in is RSocketRequester and RSocketMessageHandler both of which already default to composite metadata anyway, leaving only the routing MimeType to be used potentially but much less likely. Due to existence of similar constants in the RSocket itself, i.e. WellKnownMimeType, we can get by internally too without declaring MimeType constants from a central place.
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