You can always do the GRT by using only the key...
Uh, that's sometimes the hard part. Suppose you wanted to sort by a floating point number (say, age in days), then descending by a string of varying length that might have a NUL in it, and then descending by another integer (byte size). Quick, construct the GRT for that. Not easy, huh. Trivial in the ST.
Yes, you can always get a single GRT string for a multilevel sort. But sometimes, as I said, it takes a frickin' genius.
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