-*- Outline -*-
PARSE-NUMBER is a library of functions which accept an arbitrary
string and attempt to parse it, if possible into one of the standard
Common Lisp number types without using the reader, or else signal an
error of type INVALID-NUMBER
* Functions
PARSE-NUMBER (string &key start end radix)
PARSE-REAL-NUMBER (string &key start end radix)
PARSE-POSITIVE-REAL-NUMBER (string &key start end radix)
* Error conditions
INVALID-NUMBER (inherits PARSE-ERROR)
** Accessors
INVALID-NUMBER-VALUE
INVALID-NUMBER-REASON