Escaping the escape (Was: I-D ACTION:draft-klensin-unicode-escapes-00.txt

On Fri, Jan 19, 2007 at 10:34:27AM -0500,
 John C Klensin <klensin@xxxxxxx> wrote 
 a message of 179 lines which said:

> In the absence of comments, I will be pushing for Last Call fairly
> soon.

I may be blind but I do not see a discussion about how to escape the
escape sequence. For instance, when discussing the XML standard
(&#nnnn;), there is no mention that it requires a way to write a bare
& (&amp;).

In the same way, if you use the \unnnn standard, how do you ensure
that you can still write a real \u string if you want it?

It seems this is important enough to postpone the Last Call.