Fast SEQUENCE iteration in Common Lisp

The same day, after this post, SBCL's main developer made reduce faster (https://www.reddit.com/r/lisp/comments/1pmip8o/fast_sequence...). Let's see on the next SBCL release what the final results are.

> sequences are a band-aid over the lack of real iterator protocol

Wouldn't it be better to solve that problem? Proper generalized iteration with generators is just semicoroutines which can be implemented by swapping around stack pointers with zero copying. Should be competitive performance wise.

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