From: Brian Candler <b.candler@...>
Date: 2009-07-29T19:21:55+09:00
Subject: Re: upcase in 1.9.2-preview1

Bertram Scharpf wrote:
> Vim's ~ operator cycles through the three values. How will or
> should Ruby treat them?

I only have access to a slightly older 1.9.2 here, but:

>> RUBY_DESCRIPTION
=> "ruby 1.9.2dev (2009-04-08 trunk 23158) [i686-linux]"
>> ["\u01f1", "\u01f2", "\u01f3"].each { |c| puts c =~ /[[:lower:]]/ }


0
=> ["捻", "撚", "燃"]
>> ["\u01f1", "\u01f2", "\u01f3"].each { |c| puts c =~ /[[:upper:]]/ }
0


=> ["捻", "撚", "燃"]

So the first is upper, the third is lower, and the second is neither :-)

upcase/downcase does not affect any of them - but I'm not sure if the 
current behaviour is correct, which is why I started this thread.
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