Oh man, what a legend this guy is. Using an ambiguity in Klingon lore to explore yet another micro-tonal system is just incredible. And he profoundly apologizes for an off-by-one error he made in the previous video ... as if that hasn't happened to most of us :-)
FYI: I guess there is a minor typo in the README example: the argument of the second call to fib() in the non-coros version of the code should be "n-2" and not "n-1".