I personally have a lot of informations coming from my text editor (emacs) when writing code, and I only want to say that your example does the opposite of what

I personally have a lot of informations coming from my text editor (emacs) when writing code, and I only want to say that your example does the opposite of what you meant; because of the type system, typing Rectangle TAB would likely print Rectangle(width, height) automatically and inform you with "width, a 32 bit float; height, a 32 bit float". I fail to find a better example (complex functions of high arity with parameters from the same type ?).