test/ruby/enc/test_case_comprehensive.rb: Changed testing logic in to
catch unintended modifications of characters that do not have a case
equivalent in the respective encoding.
enc/iso_8859_1.c, enc/iso_8859_15.c: Fixed unintended modifications of
micro sign and y with diaeresis.
catch unintended modifications of characters that do not have a case
equivalent in the respective encoding.
micro sign and y with diaeresis.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55626 b2dd03c8-39d4-4d8f-98ff-823fe69b080e