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This exposes a Data.Version.Version representing the version of the Unicode database used by `base`. This should clear up some confusion I have seen in tickets regarding with which Unicode versions a given GHC can be expected to work. While in town I also regenerated (but did not update) the Unicode database with database 12.0.0. Strangely, the file cited in the README no longer existed. Consequently, I used https://www.unicode.org/Public/12.0.0/ucd/UnicodeData.txt and was slightly surprised to find that there were a few changes.
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