Description:
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The XMLReader::expand() method has an optional parameter ( http://php.net/manual/en/xmlreader.expand.php ) but the number of parameters returned by reflection is 0.

Test script:
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<?php
$rm = new ReflectionMethod(XMLReader::class, 'expand');
var_dump($rm->getNumberOfParameters());
var_dump($rm->getNumberOfRequiredParameters());

Expected result:
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int(1)
int(0)

Actual result:
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int(0)
int(0)