zendframework/zf2#6904 zendframework/zf2#6773 - `valid()` should return `true` also for `false` and `null` values in the `PriorityList`
zendframework/zf2#6904 zendframework/zf2#6773 - `valid()` should return `true` also for `false` and `null` values in the `PriorityList`

ezimuel/zend-stdlib,akrabat/zend-stdlib,MadCat34/zend-stdlib,php-refactoring/zend-array-utility,sravanchandj/zend-stdlib,adamlundrigan/zend-stdlib,weierophinney/zend-stdlib