Backport #2532: Backport r26052 into ruby_1_9_1 branch
http://redmine.ruby-lang.org/issues/show/2532

Author: Alexey Froloff
Status: Open, Priority: Urgent
Category: core

$ ruby -e 'p "foo".center(7, "qq")' 
"foo"
$ ruby -v       
ruby 1.9.1p376 (2009-12-07) [i586-linux-gnu]


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