I'm sorry if this has been discussed before or is part of the let's-replace-elisp-thread I've mostly been skipping. Or if has already been implemented, I still use XEmacs 20.4 Very well. I find the 28 bit limit on integers to be extremely painful. Would everything break if we link with GMP (a GNU multiple precision library which is quite efficient) for the integer stuff? Or as a backwards compatible way, implement it as a library so we can do things like (require 'gmp), (gmp-add (gmp-pow 2 512) (gmp-pow 2 3842)) or something. To implement Kerberos 5 with strong encryption in elisp, this is almost a must-have. /s