[Issue 11808] std.uni.CodepointSet('А', 'Я'+1, 'а', 'я'+1) asserts

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=11808



--- Comment #3 from Илья Ярошенко <ilyayaroshenko at gmail.com> 2013-12-24 05:38:59 PST ---
I think that we need to allow in constructor:
1. an empty range: [a..a+1)
2. two or more ranges that looks like : [a..b+1) [b+1..c) like in bug example
(this case IS NOT overlapping).
3. unordered intervals (user don't know я>Я or Я>я)

But do not allow partially overlapped intervals. 
For overlapped intervals operator "|" should be using.

PS
Excuse me for my English.

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