That horse has been beaten to death elsewhere. Go is [a] sweet language, don't get me wrong, but it is a mixed bag of extreme brilliance ('select') & head-scrat

That horse has been beaten to death elsewhere. Go is [a] sweet language, don't get me wrong, but it is a mixed bag of extreme brilliance ('select') & head-scratching wtfs (OP). Interfaces are hardly new. Go's novel take is the 'auto-morphism'[1] of types that (happen) to implement the function set aggregated in an interface. And this approach has its strengths and its weaknesses. [1]: ok, I made that up.