It drives me nuts when programming languages have More Than One Way To Do It for things that should by now be kinda I wish I'd hope freaking standard, freaking figured out.

To wit, mixins in Typescript. I mean, ff'ss, a supposedly 'modern' language that utterly fails to have either mixins or has-a-delegation?

Oh my freakin' god and I really hate it when people are either just ignorant, or clueless, or just have no good taste what-so-ever, and run around claiming, "oh sure Typescript has had mixins since 2.2" which if you ask me is watery bull excrement.

(Or see just about anything in JavaScript. Or anything that uses a macro in Haxe. Or any language that doesn't have a 'newtype' equivalent. Or enums. Or first order lambdas. Or any number of things that should be bloody de rigeur by now. Yes, PLT is really hard, I know, I know.)