Add test cementing memoization of falsey return values - #117
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Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Adds a data-driven test asserting that
once()memoizes falsey return values (null,false,0,0.0,'','0',[]): the value is returned as-is and the callback runs exactly once.This locks in the current behaviour so a truthiness-based cache check (as proposed in #116) can't regress it unnoticed.