* Make the correctness-checking code for changed arguments in safe
code check required arguments pairwise with EQL first -- if they
match, the applicable methods must be the same and we can elide the
This makes things like (apply #'call-next-method r1 r2 :foo foo rest)
not suck horribly in safe code.
Could still be better, but this much was quick and easy.
* Make the &REST list in CALL-NEXT-METHOD dynamic-extent. This helps
normal safety code as well.