Guys,

I am sorry for your loss here.

    def example(x) when not is_map_key(x, :foo)

I think this also shows that merely copy/pasting ruby's syntax, isn't an automatic win. I noticed this before with crystal, though naturally crystal had types from the get go.

Fundamentally:

   def foo()
   end

should stay simple. And this is no longer the case now.

(Ruby also went in error, e. g. "endless methods". I don't understand why programming languages tend to go over the edge in the last 5 years or so.)