String#-@ deduplicates unfrozen strings #4983
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Already-frozen strings remain unchanged for compatibility. https://bugs.ruby-lang.org/issues/13077 jruby#4876.
c&p from 15ef28a991f66f65bb29751cf2bef3bcb51066fc. jruby#4876
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For Ruby 2.5 support
https://bugs.ruby-lang.org/issues/13077