Clearify serialization error message (#161)

Merge pull request #156 from jdecool/stringable-implementation

Implement Stringable interface on Enum

Update branch alias

Merge pull request #154 from marc-mabe/3.x-php8.1

Support PHP-8.1

Merge pull request #153 from marc-mabe/upgrade-dev

Upgrade dev dependencies

Merge pull request #150 from marc-mabe/8.1

PHP 8.1 Support

Merge pull request #149 from marc-mabe/ghaction

Migrate from travis to GH workflow

update branch alias

Generics + better doc types PHPStan/psalm (#138)

* introduce phpstan analizing and document generics

* phpstan 0.12.7

* rebase fixes + PHPStan update

* fixes

Merge pull request #137 from marc-mabe/fix-EnumSet-getBinaryBitsetLe

fixed TypeError in EnumSet::getBinaryBitsetLe() …