Hi, I’m coming back to this thread after some discussions about related matters off-list. I’m firmly convinced this is a good idea, now:
* It would be very useful to extend the callable type hint to support typed parameters and return types. If we were to do so, its validation rules should follow inheritance’s. It would be really unfortunate if you couldn’t pass an untyped callback to a callable with typed parameters. * With the Scalar Type Hints RFCs, and other future RFCs, more type hints may be added to the language. It’d be a shame if existing interfaces couldn’t have type hints added to them. * Contravariance is widely accepted as being sound for parameter types. * We already have covariance for return type existence. So why not contravariance for parameter type existence? I hope we can have this added. -- Andrea Faulds http://ajf.me/ -- PHP Internals - PHP Runtime Development Mailing List To unsubscribe, visit: http://www.php.net/unsub.php
