Re: Address issue with decorated Latin characters
Source: Mark Davis
We changed the following characters to Uppercase, but didn't add them to
Alphabetic. That showed up in the invariant tests, because it breaks a
stability constraint. So the change was pulled from the release.
- 1F130..1F149 #  (🄰..🅉) SQUARED LATIN CAPITAL LETTER
A..SQUARED LATIN CAPITAL LETTER Z
- 1F150..1F169 #  (🅐..🅩) NEGATIVE CIRCLED LATIN
CAPITAL LETTER A..NEGATIVE CIRCLED LATIN CAPITAL LETTER Z
- 1F170..1F189 #  (🅰..🆉) NEGATIVE SQUARED LATIN
CAPITAL LETTER A..NEGATIVE SQUARED LATIN CAPITAL LETTER Z
We have to
decide what to do for Unicode 7.0. I think we have two choices:
A. Make them
both Uppercase and Alphabetic
confusing for users and programmers, since it removes the
inconsistency with U+24B6 ( Ⓐ ) CIRCLED LATIN CAPITAL LETTER A (the
latter is both Uppercase and Alphabetic).
B. Leave them as
they are in 6.3 (neither Alphabetic nor Uppercase).
Advantage: if we
were ever to add the lowercase Squared/Negative Latin letters, we
could not make them casing pairs.