David: What you propose is sensible; although I believe that a treatment
of ß and SS will differ significantly in width. We're aiming for long-
term metrics stability of included coverage between major releases, so
while we can update glyph and hinting data it is going to be very hard
work to provide a pleasing ß stretched up to the bounding box providing
by initially include SS, if it turns out to be needed later.

I cannot predict how the German language will involve within the next
decade (but the hints are there in the wording of the rules and the
Unicode track being taken) and, if RdR do indeed include a 30th capital
letter in the language and, if the Germanic governments ratify such a
revision of the orthography and, if then perhaps further, it is taught
in schools and children have the requirement to see on-screen all 30
lowercase and all 30 uppercase, _then_ we would not be able to meet that
requirement.  We would need to break metrics in order to close up the
width and break our own published intention of stability.

The risk from backing ourselves into this rather awkward corner are
quite large and so in preference it might be better to ship a missing
entry for the medium-, or long-term at that codepoint (this would allow
substitution from other fonts to occur), ensuring that various articles
trying to discuss the subject matter do at least display in a sensible
fashion:

  http://de.wikipedia.org/wiki/ß
  http://en.wikipedia.org/wiki/Capital_ß

-- 
Expansion: 'ẞ' LATIN CAPTIAL LETTER SHARP S (U+1E9E)
https://bugs.launchpad.net/bugs/650498
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