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WeakMap::offsetExists(): document that null values return false - #5962
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lacatoire
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Oct 19, 2026
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Adds a note that offsetExists() behaves like isset() and returns false when the stored value is null, even though the object is still in the map (see php/php-src#8437).
Checked with PHP 8.4: after
$map[$obj] = null,offsetExists($obj)is false whilecount($map)is 1.Fixes #4727