German sharp S uppercase mapping

[Daniel Buncic]

>> The long ſ, which is only used in old Fraktur script, but not in
>> modern Antiqua script, has the same issue.

Except that in Fraktur there are no all-caps words, so that the function 
to_upper() has no use in a Fraktur text anyway.

(For example, a modern Bible printed in Antiqua might have words like 
GOTT ‘GOD’, JESUS, der HERR ‘the LORD’, etc. printed in all-caps to mark 
them as sacred.  In old Bibles printed in Fraktur, something like 
𝔊𝔒𝔗𝔗, 𝔍𝔈𝔖𝔘𝔖 or 𝔡𝔢𝔯 ℌ𝔈ℜℜ is quite unthinkable because 
all-caps Fraktur words are basically illegible.  What you can find in 
old Bibles is the use of two capitals at the beginning to emphasize 
words, e.g. 𝔊𝔒𝔱𝔱, 𝔍𝔈ſ𝔲𝔰, 𝔡𝔢𝔯 ℌ𝔈𝔯𝔯.)

Best wishes,

Daniel

-- 
Prof. Dr. Daniel Bunčić
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