[PATCH] Say explicitly that eq is useful for chars; xref number comparison, lispref

[Stephen J. Turnbull]

QUERY

Aidan Kehoe writes:

 > 	also mention that #'eq gives t when passed identical integers

I don't think this is true when bignums are enabled because they do
not have an immediate representation.  It's only true for fixnums,
which do.  It's true for characters, which also have an immediate
representation.  You should a mention that this is an implementation
detail, although it's very unlikely to change.  Unless Emacs promises
that this is true?

 > +characters and integers with the same numeric are @code{eq}.  Under
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