From: Brian Candler <b.candler@...>
Date: 2009-07-29T19:32:39+09:00
Subject: Re: upcase in 1.9.2-preview1

Brian Candler wrote:
> Can someone confirm whether this is intentional or not?
> 
>>> s = "端ber"
> => "端ber"
>>> s.upcase
> => "端BER"

To answer my own question: looking at the source code, it looks like 
this *is* intentional. From encoding.c:

int
rb_enc_toupper(int c, rb_encoding *enc)
{
    return 
(ONIGENC_IS_ASCII_CODE(c)?ONIGENC_ASCII_CODE_TO_UPPER_CASE(c):(c));
}

int
rb_enc_tolower(int c, rb_encoding *enc)
{
    return 
(ONIGENC_IS_ASCII_CODE(c)?ONIGENC_ASCII_CODE_TO_LOWER_CASE(c):(c));
}

That is: only ASCII characters (potentially encoded as UTF16 or 
whatever) are eligible for case conversion.
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