LibDispellable-1.0 aims at helping to test if the player can really dispel an enemy buff or a friend debuff.
The current Blizzard implementation for a curable buff filter ("HARMFUL RAID") does not take talents into account. There is no way to test for buffs that players can dispel on their enemies. LibDispellable-1.0 provides methods to test both defensive and offensive dispels.
See the API page on wowace.com for usage.