Thinking on this for a while, it makes more sense to spend optimization effort on a few widely useful engines which will improve many people's code in many situ

Thinking on this for a while, it makes more sense to spend optimization effort on a few widely useful engines which will improve many people's code in many situations, than on hundreds of narrow improvements which might improve some code in some situations and will add a lot more integration risk and maintenance overhead. Turning +/iota into a constant time formula feels like a great idea APL is in a position to benefit from, and that mathematicians could see endless places where that kind of thing might be possible - but if that's true, APL users could find them when they need them. They can't find vectorised pick of grade up, ever. This is so interesting, thank you.