Description:
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ReflectionMethod::getParameters() for ArrayObject constructor returns one parameter, although in practice the function accepts three parameters (and documentation states the same).
https://3v4l.org/MfKsQ

Test script:
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<?php

$ref = new ReflectionClass('ArrayObject');
var_dump(count($ref->getMethod('__construct')->getParameters()));

Expected result:
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int(3)

Actual result:
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int(1)