On Tue, May 19, 2020 at 07:43:00AM +0200, ASSI wrote:

[...]

> [...]  Neither "fs" nor "fz" should ligature into "ß" (which is a
> proper glyph these days and no longer a ligature, although you are still
> allowed to break it into either "ss" or "sz" when using typefaces that
> don't support it, like most versalia).

Definitely. This "long" and "short" vaiants of s were in use in Germany
early in te twentieth, in Fraktur and also in handwriting [1]. This two
forms of "s" (one for terminal position) still exists in Greek. The
ß "ligature" (which isn't perceived as such nowadays) evolved from
"ss", the first s being a non-terminal (yeah, looks a bit like an "f"
to the untrained eye).

In the German speaking part of Switzerland, "ß" is always replaced by
"ss". There's no capital version of "ß", you use "SS" (thus breaking
bijectivity of upper- and lowercase).

Writing is human. Human is messy :-/

Cheers

[1] https://de.wikipedia.org/wiki/S%C3%BCtterlinschrift
-- tomás