It's a fair complaint. Duplicating code just for the sake of type specialization is annoying and interface{} has it's costs as well as dangers. However, the bu

It's a fair complaint. Duplicating code just for the sake of type specialization is annoying and interface{} has it's costs as well as dangers. However, the built-in arrays, slices, and maps (which are parametrically polymorphic) seem to have covered all the cases where I need parametric types so far. Maybe I'm just lucky or haven't written enough lines of Go but it seems like an 80/20 sort of feature in the presence of the built-in maps.