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Use check output mode in not combinator #1850

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The not combinator doesn't actually use the output of its child parser, so it seems reasonable to force the output mode to Check as a performance optimization. In a reasonably complex parser, this has improved by ~10% and up to 25% in some scenarios.

@appellation appellation requested a review from Geal as a code owner April 21, 2025 18:57
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