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The definition given for STRING-CHAR-CODE-LIMIT is too simplistic.
In VAX LISP for example, a character can't have bits or font if it
is to be stored into a simple-string.

As Scott says, STRING-CHAR-P exists exactly so that you can find out
if a character is a string-char.  You might want to build a table with
an entry for every string-char; then STRING-CHAR-CODE-LIMIT might
be useful.  However, you can figure out how big to make the table
using CODE-CHAR.

I guess it would be wrong to assume that STRING-CHAR-CODE-LIMIT = 
CHAR-CODE-LIMIT.  But I bet that equality holds for every implementation.

- Paul