.@CoverallsApp can give useful insight on your code. Here I can see which code paths are executed on which Emacs version!
miniblog.
Related Posts
Advice from one of the authors of Common Lisp on PL work: established languages tend to win in their domain. It really helps if you enjoy working in this space.
(There is a ton of PL skill and insight in the smaller languages IME.)
https://pldb.com/posts/scottFalhmanInterview.html
Interesting insight: variadic functions make infix operators less necessary. From
"self is dynamic, but super is static" #pharomooc discussing method lookup. Profound insight, but breaks if you allow multiple inheritance!