CHAR=
=====

Syntax: (char= {<character> ...})

This function compares the given characters in the
same way like numbers.

The following ordering on characters exists:
 
A < ... < Z
a < ... < z
0 < ... < 9

The ordering between those groups is unspecified and
depends on the implementation. But most of the time
the characters are in the ASCII ordering.

0...9 < A...Z < a...z.

It returns T, when the ordering is given,
otherwise NIL.

example:       >(char= #\a #\A)
               NIL