Tail recursion optimization, not all calls. So no continuations, etc.

And it's probably slow as hell.

And I'll knife you if I see you using Python like this.

See also an alternative implementation in the LTU discussion http://lambda-the-ultimate.org/node/1331#comment-15165.

Also, for those who missed it, Guy Steele's older post about why tail calls are important: http://projectfortress.sun.com/Projects/Community/blog/Objec...

Oh my -- "optimization" is a very poor choice of word here!