The million dollar (perhaps literally) question is – could @kentonv have written this library quicker by himself without any AI help?
My problem is that (in my experience anyways) this is slower than me just writing the code myself. That's why AI is not a useful tool right now. They only get it right sometimes so it winds up being easier to just do it yourself in the first place. As the saying goes: bad help is worse than no help at all, and AI is bad help right now.
How much experience do you have writing code vs how much experience do you have prompting using AI though? You have to factor in that these tools are new and everybody is still figuring out how to use them effectively.