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This branch fixes the tests on Julia 1.3, by replacing a sum of an empty list with a reduce that has an initial value. It also fixes one test error on Julia 1.7 (DataType.mutable has been replaced by ismutabletype()), but more remain. I likely won't have time to get to investigating them until next week. I also haven't investigated the Windows test failures yet.
Since test suite work is happening in #389, I based my branch off that one. Let me know if you'd like a different base.