giles
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(take-while-o pred l result): take elements from l while pred holds, stopping at the first element that fails. (drop-while-o pred l result): drop matching elements, return the rest including the first non-match. Together: (take-while p l) ⊕ (drop-while p l) = l, verified by an end-to-end roundtrip test. 8 new tests, 546/546 cumulative.