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.
IMHO more rigorous test automation (including fuzzing and related techniques) is needed. Actually that holds whether AI is involved or not, but probably more so if it is.