formatting does depend on the type of variables. Go look at ktfmt’s codebase and come back after you’ve done so…

I skimmed it. It appears to visit the AST of the code and format that, as any formatter does. ASTs have not been type checked.

Can you give an example?

it gives you an option, just like if it was an interface. Did you actually try this out before commenting?

Precisely! It doesn't know the answer so it has to guess, or make you guess.

And how often are you naming functions the exact same thing across two different classes without using an interface?

You mean how often does the same field name come up more than once? All the time obviously! Think about common names like id, size, begin, children, etc. etc.

I’m sorry, but you clearly haven’t thought this out, or you’re really quite ignorant as to how intellisense works in all languages (including Ruby, and including statically typed languages).

I'm sorry but you clearly haven't thought this through, or you're just happy to ignore the limitations of Ruby. I suspect the latter. Please don't pretend they aren't limitations though. It's ok to say "yes this isn't very good but I like Ruby anyway".