If you voted against the Interface Default Methods RFC for #PHP, please take a moment to read some of the most recent mailing list replies, starting with @Crell’s here: https://externals.io/message/120725#120798
I agree this feature goes against a lot of what I’ve learned as “best practices,” but I did a lot of introspection on this and decided that this feature is good for the future of the PHP language. It unlocks a lot of potential.
