Which of our Lisp implementations support > 63 function arguments? I know
GCL does not. If the most important platforms do not support > 63 function
arguments, we should probably (alas) inherit that limitation in Maxima,
explicitly prohibiting > 63 arguments in mapply so that Maxima code will be
portable between platforms.
In almost all cases where people are using apply with a large number of
arguments, the function is associative, and xreduce does the right thing.
We should be encouraging the use of xreduce.
-s