It would be sensible to case-map ß to ẞ however.
> On 30 Jun 2017, at 16:29, Otto Stolz via Unicode <unicode@unicode.org> wrote:
>
> Hello,
>
> der Rat für deutsche Rechtschreibung which is responsible for the further
> development of the official German orthography has finally recognized LATIN
> CAPITAL LETTER SHARP S as a possible upper-case equvalent for the LATIN SMALL
> LETTER SHARP S.
>
> The report announcing the change is dated 2016-12-08, but the official rules
> have been updated only yesterday, so the change is currently in the news (not
> very prominently, though).
>
> The pertinent section from the official 2107 rules reads thusly:
>> § 25 E3
>> Bei Schreibung mit Großbuchstaben schreibt man SS. Daneben ist auch die
>> Verwendung des Großbuchstabens ẞ möglich. Beispiel: Straße – STRASSE
>> –STRAẞE.
>
> Which translates to:
>> When writing all caps, you spell SS. Alternatively, it is possible to use
>> the upper-case ẞ. Example: Straße – STRASSE –STRAẞE.
>
> So, SS remains the primary upper-case equivalent of ß. Yesterday’s note to
> the press says that the capital ẞ is meant mainly for passports and similar
> official documents, wich have to reproduce personal names faithfully in their
> respective spelling variants. E. g., Passports used to distinguish proper
> names such as GROẞMANN and GROSSMAN; up to now, they usually have spelled
> GROßMANN, with a small ß between the capitals, which renders ugly, in most
> fonts.
>
> Best wishes,
> Otto
