My friend is working on KlongPy (https://github.com/briangu/klongpy https://github.com/briangu/klongpy) which is has a terse array-notation language similar to

My friend is working on KlongPy (https://github.com/briangu/klongpy https://github.com/briangu/klongpy) which is has a terse array-notation language similar to APL. I'm curious: Is there anything interesting in APL that hasn't yet been implemented in NumPy, etc.?