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This adds support for UTS #46 (http://unicode.org/reports/tr46/). One of the requirements of UTS #46 is to perform Unicode normalization. This was only added natively in Ruby 2.2. It will load the unf gem if no supported method is available.
I'm not sure if this is the best strategy, but it works.
This includes the full UST #46 test suite which all pass.