The million dollar (perhaps literally) question is – could @kentonv have written this library quicker by himself without any AI help?
If a robot assembles cars at lightning speed... but occasionally misaligns a bolt, and your only safeguard is a visual inspection afterward, some defects will roll off the assembly line. Human coders prevent many bugs by thinking during assembly.
I'm far from an AI true believer but come on -- human coders write bugs, tons and tons of bugs. According to Peopleware, software has "an average defect density of one to three defects per hundred lines of code"!