Actually surprised to here that, as with the exception of tab, I perceive
the remaining control characters to have no common semantics, other than
being used by various platforms as being being semantically equivalent to
newline; and correspondingly perceive newline not to be literal character,
but an abstraction for the end-of-line sequence as presumed by various
different platforms, which is how it's historically been treated.

> From: bear <xxxxxx@sonic.net>
> Date: Sun, 15 Feb 2004 13:40:17 -0800 (PST)
> To: Ken Dickey <xxxxxx@allvantage.com>
> Cc: srfi-52@srfi.schemers.org
> Subject: Re: char-whitespace?
> Resent-From: srfi-52@srfi.schemers.org
> Resent-Date: Sun, 15 Feb 2004 22:40:28 +0100 (NFT)
>
> On Sat, 14 Feb 2004, Ken Dickey wrote:
>
>> I just noted that Tab, Form Feed, Line Feed, and Carriage Return have Unicode
>> class Cc [Control Code] and are not in Zs (Separator, space) or Zl
>> (Separator, line).
>>
>> I suspect the char-whitespace? definition should include them.
>
> agreed.
>
> Bear
>