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Larry Garfield's comments here and here on the mailing list were convincing (read them!) But also every day I Ctrl+Click a method call, only to reach the interface instead of the implementation. More often than not, I'm looking for the implementation, so this slows me down. A default instead of a trait is less code, and smoother developer experience (DX).
We spend a lot more time reading code than writing it. The elegance of short closure combined with the convenience of variable scope usage has already shown to be a game changer on Typescript and there doesn’t seem to be any technical issue with having it on PHP.