Comment made by: mobiusinversion

I agree, this is a low priority enhancement. I think it could make the Protocol experience more DWIMy, and Java 8 has default implementations on interfaces for the same kind of convenience.

I don't think we need it. What's the rationale behind extending some protocol, not implementing its methods, and then calling those methods, expecting them not to throw. Be explicit about what yout type should do, whether it is a default or custom behavior. You basically have three options

or

or

I think however that my first approach is unidiomatic and you should prefer the latter ones.

Comment made by: mobiusinversion

As it stands you have to workaround with this

http://stackoverflow.com/questions/15039431/clojure-mix-protocol-default-implementation-with-custom-implementation