# File lib/backports/2.2.0/string/unicode_normalize.rb, line 16
      def unicode_normalize!(form = :nfc)
        require 'backports/tools/normalize.rb' unless defined? UnicodeNormalize
        # String.send(:define_method, :unicode_normalize!, ->(form = :nfc) { replace(unicode_normalize(form)) } )
        replace(unicode_normalize(form))
      end