Overwrite return type-hint into a more specific one

Hi internals, On experimenting with return type-hints I noted an inconsistency on overwriting an existing hint to a more specific one. On adding a non existing return type-hint on overwrite it's fine but it's logically the same (this previously was an E_STRICT). http://3v4l.org/YdB8s - works fine (E_STRICT lower then php7@20150401) http://3v4l.org/UDk0n - Fatal error: Declaration of Bar::setTest() must be compatible with Foo::setTest($test): Foo http://3v4l.org/AuOsr - HHVM works fine Marc