Current version:
name, rank, icon, count, debuffType, duration, expirationTime, unitCaster, isStealable = UnitAura("unit", index or ["name", "rank"][, "filter"])
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Awesome new version:
name, rank, icon, spellID, count, debuffType, duration, expirationTime, unitCaster, isStealable = UnitAura("unit", index or ["name", "rank"][, "filter"])
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spellID - exactly what you think it'd be