bug#21816: elisp-mode-tests fails on a case-preserving filesystem

[Alexis <flexibeast@gmail.com>]

Stephen Leake <stephen_leake@stephe-leake.org> writes:

> I think changing CAPITAL ẞ to "SS" is not strictly a "casing" 
> issue?

Oh, no, it is; a capital Eszett is not at all undebatedly 
canonical. E.g. Wikipedia calls capital Eszett 'contestable':

    https://en.wikipedia.org/wiki/Capital_%E1%BA%9E

This page:

    http://sites.psu.edu/gotunicode/2008/07/18/a_new_german_unicode_letter_ca/

has some more details, including noting that:

    "[i]n official German spelling convention, there is NO CAPITAL 
    SHARP S."

although in 2010 an exception was made:

    "However, in 2010 the use of the capital sharp s became 
    mandatory in official documentation when writing geographical 
    names in all-caps." 

Though i doubt that /all/ usage patterns have adjusted in response 
to this. Thus, the conservative approach is to assume that 'SS' is 
indeed /the/ capital form of ß. The above Wikipedia page goes on 
to note:

    "As of April 2008, typographers have yet to agree on a 
    standard form for the letter capital ẞ, as they did in 1903 
    when an association of German printers and type foundries 
    agreed on the 'Sulzbacher Form' as standard for the lowercase 
    ß."

Hence the capital Eszett only appearing in Unicode 5.1 - iiuc, due 
to the 2004 proposal arguing for a capital Eszett in Unicode on 
the basis that there are typefaces with a capital Eszett now out 
in the wild - and not appearing at all in ISO-8859-1, even though 
ß is there.


Alexis.