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Apparently you can't write in any old string into the license field, so
my SPDX-formatted license caused the build to fail.
It was a bit difficult as a complete beginner to figure out how I was
supposed to format the version given the `(Maybe Version)` in the
documentation:
https://www.haskell.org/cabal/release/cabal-latest/doc/API/Cabal/Distribution-License.html#t:License
but fortunately a search through some open source Cabal files on GitHub
revealed the answer. Disappointing, though, that I can't declare the `+`
part of the license in an officially supported capacity, but okay.
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