Implemented enhancements:
- Allow installing and build on PHP 8 #1267 (sanmai)
- Use phpstan/phpdoc-parser to retrieve additional type information from PhpDoc #1261 (Namoshek)
- DoctrineObjectConstructor Using array_key_exists() on objects is deprecated in php7.4 #1253 (gam6itko)
- Add Composer cache for v2 on Travis CI #1266 (sanmai)
- Allow interfaces for DocBlock #1256 (marein)
- Allow interfaces for typed properties #1254 (marein)