Capital sharp s

Hi!

I'm not sure whether I spotted a bug or a feature in the 5.1.0beta.
It is about casing of the new 1E9E LATIN CAPITAL LETTER SHARP S.

My understanding was that with existing text, nothing changes, i.e.,

    toupper("=C3=9F")  =3D "SS"
    casefold("=C3=9F") =3D "ss"

and that the new capital sharp S would behave as follows:

    tolower("<CAPITAL SHARP S>")=3D  "=C3=9F"
    casefold("<CAPITAL SHARP S>")=3D "ss"

However, there is no entry in the CaseFolding list nor in
SpecialCasing for 1E9E in the Unicode 5.1.0beta.  The following
document does propose an entry in CaseFolding:

    http://std.dkuug.dk/jtc1/sc2/wg2/docs/n3227.pdf

Is this a bug or a feature?

Bye,
  Henrik