From: Uri Bernstein (uriber@gmail.com)
Date: Sun Oct 02 2005 - 03:07:39 CST
I recently became aware of some changes made in Unicode 4.1.0 to the
bidi categories of some characters, most noticeably U+2212 MINUS SIGN.
These changes were presented as PRI 57, and approved on 2005-02-14.
Unfortunately, this change made it impossible to embed negative
numbers (such as "-5") in right-to-left text, without resorting to
bidi control characters.
After the bidi category of HYPHEN-MINUS was changed (between 4.0 and
4.0.1), that character could no longer be used any more as a unary
minus in RTL text. However, there was a solution: using MINUS SIGN
instead. But with this recent change, even this no longer works.
I would like to know what was the reasoning behind the changing the
category of MINUS SIGN. I would also like to know what is currently
the recommended way of embedding a negative number in RTL text.
--- Uri Bernstein
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