I am someone who has shipped code in many "less popular" languages (Erlang, Eiffel, Lisp...) and am currently exploring / building apps with Go. As someone wit

I am someone who has shipped code in many "less popular" languages (Erlang, Eiffel, Lisp...) and am currently exploring / building apps with Go. As someone with some actually time with Golang, could you elaborate on the pain point a bit? I had a similar issue on my first toy program with Golang, but found it trivial to check the implemented methods, or assign it and let the compiler blow up if it doesn't fulfill the needs.