Treat combined durations as a single unit
Prior to this commit, `3.months - 3.months` would result in a duration that has the "parts" of `[[:months, 3], [:months, -3]]`. This would mean that it was subtly different than `2.months - 2.months`. When applied to a time, the date might actually change if the resulting day doesn't exist however many months in the future, even though in both cases we just wanted to add `0`, which should always be an identity operation. With this change, we now store the parts as a hash, so `3.months - 3.months` is simply stored as `{ months: 0 }`.
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