Re: string too long from write-char

    [3]> (copy-utl2 *terminal-io*)
    [ writes 160000 spaces ]

BTW, the reason for 160000 was that all my cursor positioning 
multiplies the number of output characters by ~ 5e6/160000

I now have followed the code a little further back - yes it's due to
readline. 
stream.d :
#ifdef GNU_READLINE
/* We use the GNU Readline-Library. It returns the Input line-by-line,
   with possibility for editing, completion and History. unfortunately we
   have to save the Output intermediately line-by-line in order to be able to
   use the last commenced line as "Prompt". */
#define HAVE_TERMINAL3
/* define TERMINAL_LINEBUFFERED  1
   define TERMINAL_OUTBUFFERED   1 */
#endif

and this causes it to save a string containing the current line

So, if you have readline in your lisp, writing spaces to *terminal-io*
does eventually lead to
 *** - string too long: desired length ...
exceeds the supported maximum length

I just got that from a fresh clisp doing
(loop for i below 6000000 do (write-char #\space *terminal-io*))

However the number is quite a bit larger if you use a 64 bit build.

So my suggestion now is that readline be specifically limited to
some reasonable buffer size, like maybe one million characters.

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