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Dynamic typing, special and unique syntax for every language feature, interpreter intrinsics
Dynamic typing is the source of very amazing errors, see JavaScript.
I think the problems there are exacerbated a lot by over-eager type coercion and other crappy design decisions inherited from almost 30 years ago
Yep lua and lisp/scheme are also unityped and not even close to as broken. All are remarkably similar languages, theory-wise.
...also something something Guido not getting tail call elimination and people sending him copies of the wizard book. It's been a while.
(And, yes, lua does proper tail calls).
[object Object]!Reddit moment.!<
Operator overloads, descriptor protocol, decorators
Operator overloads are excellent for readable code when used well - I object to their inclusion on this list.
As long as you don't have to implement it yourself.
Honestly, I've been using type hints very heavily since they became a thing. I just use IDE completion too much to do without them.