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Re #39. I don't know that I got the implementation right, but it works so far with the test cases I've added. I hope you'll consider adding shifts to the library.
I noted that the gulpfile is not compatible with gulp 4, so it might be a good idea to change the gulp dependency to version 3. I didn't include a minified file, as it will of course be an ugly diff, but I did generate one in order to run tests.
All the best,
Karl