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Message-ID:  <4E6526DF.2060409@morningstar2.co.uk>
Date:         Mon, 5 Sep 2011 20:45:35 +0100
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              <LATEX-L@listserv.uni-heidelberg.de>
Sender: Mailing list for the LaTeX3 project <LATEX-L@listserv.uni-heidelberg.de>
From: Joseph Wright <joseph.wright@MORNINGSTAR2.CO.UK>
Subject: Comma list changes
To: LATEX-L@listserv.uni-heidelberg.de
Precedence: list
Status: R

Hello all,

We have revised the behaviour of some comma-list functions, making the
treatment of spaces and braces more consistent.

Spaces are now stripped from items when they are added to a clist, while
braces are retained. Thus

  \clist_put_left:Nn \l_my_clist { a , ~ b ~ , { c } , ~ { ~ d ~ } ~ }

will add the items "a", "b", "{c}" and "{~d~}" to the clist.

The mapping functions for 'inline' clists, for example
\clist_map_function:nN, strip spaces in the same way, so that

  \clist_map_function:nN { a , ~ b ~ , { c } , ~ { ~ d ~ } ~ } \foo:n

will result in \foo:n being mapped to "a", "b", "{c}" and "{~d~}".

As a result of these alterations, \clist_trim_spaces:N is deprecated,
and scheduled for removal by 2012-09-05. \clist_trim_spaces:n is moved
to an internal function only: it should therefore be regarded as
deprecated with respect to use outside of the kernel.
-- 
Joseph Wright