Merge pull request #65 from RouatbiH/master

Merge pull request #64 from peter279k/add_split_extra_arg

Merge pull request #63 from peter279k/fall_back_extra_argument

Revert 2bd797f commit & deprecated exception fix

Merge pull request #62 from peter279k/drop_old_php

Drop old PHP versions that are lower than 7.2

Merge pull request #58 from davidcole1340/php-81-support

Fix PHP 8.1 deprecations

bump version

implement countable interface and merge method

fix default value settings

support closure for defaultValue attribute

Merge pull request #51 from ErikBooij/master

Add PHPUnit as a dev dependency