German sharp S uppercase mapping

[Daphne Preston-Kendal]

On 2 Dec 2024, at 11:19, Marius Spix via Unicode <unicode at corp.unicode.org> wrote:

> That problem is not not new. The long ſ, which is only used in old Fraktur script, but not in modern Antiqua script, has the same issue. It shares its uppercase form S with the round s, which behaves differently than the Greek final Sigma ς and can appear mid-word, for example in compound words.
> 
> For example: to_lower(to_upper("Hauſtür")) returns "Haustür", which is inaccurate.

‘Hauſtür’ – assuming it is intended to be the door of a house – is wrong in the first place. The round s is used at the end of words within compounds.

The rule of thumb: for native words, if pronounced [z] or [ʃ], use the round s; if [s], use the long s. (Non-native words were usually set by printing them in Antiqua anyway.)


Daphne