(author here) I noticed the thing about flatten an hour ago and fixed it (somehow thought +/, is "reduce 2 times", then understood it is flatten + reduce, and m

(author here) I noticed the thing about flatten an hour ago and fixed it (somehow thought +/, is "reduce 2 times", then understood it is flatten + reduce, and my lib already had flatten, so it was easy to fix). As for "inner product", I just haven't found suitable Ruby metaphor and fell back to zip+reduce, which seems to be equivalent.