Re: [RFC] Parameter No Type Variance

2016-11-21 12:59 GMT+01:00 Christoph M. Becker <cmbecker69@gmx.de>: > On 21.11.2016 at 10:39, Niklas Keller wrote: > > > I'd like to announce a RFC to allow omitting the type declarations for > > parameters in subclasses: > > https://wiki.php.net/rfc/parameter-no-type-variance > > > > PHP doesn't currently allow variance for parameters as checking these for > > compatibility isn't possible on compile time. > > This limitation is caused by autoloading and doesn't allow widening the > > accepted parameters. > > > > This RFC proposes to allow ommiting the type entirely in a subclass, as > > dropping all parameter constraints is > > always valid according to the LSP principle. > > Have you considered that instead of simply omitting the type > declaration, one would have to mark the omission explicitly, to still > get a compile time warning in case of unintended omission > No, not really. While we could use "mixed" there, those signatures _are_ compatible without it and shouldn't throw a warning. Anyone else interested in the usage of "mixed" as an explicit type declaration?