:maximum-length from the header of an array
Major Section: ARRAYS
Example Form: (maximum-length 'delta1 a)whereGeneral Form: (maximum-length name alist)
name is an arbitrary object and alist is a 1- or
2-dimensional array. This function returns the contents of the
:maximum-length field of the header of alist. Whenever an aset1 or
aset2 would cause the length of the alist to exceed its maximum
length, a compress1 or compress2 is done automatically to remove
irrelevant pairs from the array. Maximum-length operates in
virtually constant time if alist is the semantic value of name.
See arrays.