Fix various code and doc issues (add phpstan setup) #60

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Run time

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Job	Run time
PHP 5.6	9s
PHP 7.0	9s
PHP 7.1	11s
PHP 7.2	11s
PHP 7.3	11s
PHP 7.4	18s
PHP 8.0	11s
PHP 8.1	12s
PHP 8.2	17s
PHP 8.3	11s
	2m 0s