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Fix styling

Merge pull request #212 from matthi4s/master

Fix finished process handling in PHP 8.1.22/8.2.9

Merge pull request #184 from matthi4s/master

Set return types for ArrayAccess functions

Merge pull request #181 from Stevemoretz/patch-2

Fix tests

Merge pull request #126 from barchard/patch-1

Check for proc_open

Add Pool::forceSynchronous function

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