Description:
------------
The parameter of Phar::running is optional but it is described as required by reflection.

Test script:
---------------
<?php

$rc = new ReflectionClass(Phar::class);
$rm = $rc->getMethod("running");
echo $rm->getNumberOfParameters();
echo PHP_EOL;
echo $rm->getNumberOfRequiredParameters();
echo PHP_EOL;
echo (int) $rm->getParameters()[0]->isOptional();

Expected result:
----------------
1
0
1

Actual result:
--------------
1
1
0