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Use case for utf8::upgrade?

2010-04-07 07:57:23
from [Michael Ludwig] [Permanent Link] 
Perl Unicode Advice
http://juerd.nl/site.plp/perluniadvice

Having read Juerd's list of useful advice, I don't understand the reason for 
its last three items:

• utf8::upgrade before doing lc/lcfirst/uc
• utf8::upgrade before doing case insensitive matching
• utf8::upgrade before matching predefined character classes like w and s

Can anyone enlighten me on the background of using utf8::upgrade here?
-- 
Michael.Ludwig (#) XING.com
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