* array.c (take_items): honor encoding of class name.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39882 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* KNOWNBUGS.rb: test for [Bug #8100].

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39883 b2dd03c8-39d4-4d8f-98ff-823fe69b080e