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Where? I don't see anything in that code relying on that unless I'm Sunday blind.

`results[predicate(item)]` here they get the first and the second elements of a tuple. Essentially it’s `results[False]` and `results[True]`

Oh, that's obvious now. Must be that Sunday night blindness.

Results has 2 elements indexed by 0 and 1 (it’s a tuple not a dict)