Lua extension for collision proofing

--[[
Set variables:
creature:GetData().escorted = true

Check variables:
if(creature:GetData().escorted) then
    print("Has been escorted")
end

Remove variables (on death, logout etc)
creature:RemoveData()
]]

local T = {}
function Object:GetData(instance)
    if(instance and not self:GetInstanceId()) then
        error("instance is true and object is not worldobject", 2)
    end
    local ID = instance and -self:GetInstanceId() or self:GetGUID()
    if(not T[ID]) then
        T[ID] = {}
    end
    return T[ID]
end
function Object:RemoveData(instance)
    if(instance and not self:GetInstanceId()) then
        error("instance is true and object is not worldobject", 2)
    end
    local ID = instance and -self:GetInstanceId() or self:GetGUID()
    T[ID] = nil
end