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The pattern matching algorithm doesn't mention TT bytes.
0xTT is an alias for "tag-terminating byte" (as mentioned in the definition). How can I mark it up to make that clearer? (I considered using <abbr>, but I wasn't sure.)
Just put it in the algorithm, along the lines of "if the byte in the pattern is 'TT', then...". Note that technically, "TT" isn't a "byte" as you've defined them. You might want to massage your terminology a bit so that the patterns are made of "pattern components" or some such, which can be either byte values or "TT" or something.
I've attempted to address this by adding more explicit markup and wording: https://github.com/whatwg/mimesniff/commit/444276e08f9cfdc7e40c1c33c1004aaeece35d0f I don't think that this is really that ambiguous, so I'm going to close this, but feel free to reopen if this isn't sufficient.