system
Given the following post, respond as if you're commenting on Reddit:
human
when can you say you KNOW a programming language?

when i started to learn programming, i had the goal of wanting to learn/know a programming language, but now i feel that everyday im just digging myself a hole that goes deeper with learning, and theres not really such a thing as knowing a language fully, or maybe there is. i feel i can always improve.

has there ever been a switch where you may have felt completed with your language of choice? do you ever feel you will reach that point?
gpt
When you can list half a dozen things wrong with it. Bonus points if you know why they ended up that way and why they can't be easily fixed.

Also — and possibly related —  when you know when _not_ to use that language.