Javadoc: Overveable.takeWhile vs. takeUntil: the condition is inverted #7856
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The current description of the difference between takeWhile and takeUntil just points to the evaluation time (before or after the element is emitted), but the (IMHO) more important fact is that the predicate is inverted between both:
takeWhile
emits just elements where the predicate is true,takeUntil
just elements where the predicate is false (and the first true one).