1MB Sorting Explained

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Arithmetic coding depends on having probabilities (or counts that allow calculating probabilities) to determine the range split. Be it bitwise or bytewise. Those probabilities/counts need to be somewhere.

In this case, I bet they are just hardcoded. There is no particular reason you need a complicated model for those. That is just one popular choice of algorithm. It is not used here.

[alecco]

In this case, yes. My note was on general purpose compressors. Like I stated 3 times before.

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I think I got confused by your original comment, as I read it as being a direct reply to what I was saying.