convert Unicode to lower/uppercase?

[Martin v. Löwis]

Peter Otten <__peter__ at web.de> writes:

> # The German es-zed is special--the normal mapping is to SS.
> # Note: the titlecase should never occur in practice. It is equal to
> titlecase(uppercase(<es-zed>))
> 
> 00DF; 00DF; 0053 0073; 0053 0053; # LATIN SMALL LETTER SHARP S
> [...]
> 
> Thus, to comply with the standard, "ß".upper() --> "SS" is required.

No. It would be required if .upper would claim to implement
SpecialCasing - but it makes no such claim.

> My personal impression is that, even before the orthography reform in 1998,
> the SZ variant was seldom used.

There is, of course, the famous "MASSE oder MASZE" example, in particular
in the form "WIR TRINKEN BIER IN MASSEN".

Regards,
Martin