This package defines the Common Lisp predicate cl-equalp.
This function is a more flexible version of equal. In
particular, it compares strings case-insensitively, and it compares
numbers without regard to type (so that (cl-equalp 3 3.0) is
true). Vectors and conses are compared recursively. All other
objects are compared as if by equal.
This function differs from Common Lisp equalp in several
respects. First, Common Lisp’s equalp also compares
characters case-insensitively, which would be impractical
in this package since Emacs does not distinguish between integers
and characters. In keeping with the idea that strings are less
vector-like in Emacs Lisp, this package’s cl-equalp also will
not compare strings against vectors of integers.
Also note that the Common Lisp functions member and assoc
use eql to compare elements, whereas Emacs Lisp follows the
MacLisp tradition and uses equal for these two functions.
The functions cl-member and cl-assoc use eql,
as in Common Lisp. The standard Emacs Lisp functions memq and
assq use eq, and the standard memql uses eql.