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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: [PATCH] Unicode Lisp reader escapes
Date: Fri, 12 May 2006 00:15:14 -0400
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Xref: news.gmane.org gmane.emacs.devel:54295
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    The initial `#' character is a valid Emacs hash notation for writing
    integers in various bases.  After adding `\uXXXX' it seems reasonable
    to add `#\uXXXX' as well.  However, there is one difference: Emacs Lisp
    hash notation doesn't use the backslash `\' after `#', e.g. `#x42',
    but other Lisps use the backslash in the notation of Unicode characters,
    e.g. `#\u3042'.  I have no opinion which notation is better.

I think it is better to consistent with the existing Emacs Lisp
constructs.