[GAMEPLAY] Guinsoo's Rage is not labeled UNIQUE but doesn't stack
The effects on items labeled "UNIQUE active/passive/aura" do not stack if it comes from the same item but will stack from different items. For example, 
gives 10% CDR while 
gives 20% CDR.
The effects on items labeled "UNIQUE active/passive/aura - <name>" do not stack at all (except for the sheen items which seems to be more of a special interaction of sorts). For example, 
puts both banners on cooldown when activated and 
gives +65 movements speed.
Guinsoo's Rage is not labeled UNIQUE so it should stack.
Repro steps:
- Buy one Guinsoo's rageblade and observe damage from Guinsoo's rage AOE
- Buy a second rageblade and observe damage from Guinsoo's rage AOE
Since the effects are not UNIQUE, the damage should stack and the AOE should double with two rageblades. The damage popups show that it is doing 1 more damage (rageblade gives 5 more AD than its components so 0.15*5=0.75 which would round up the displayed number by 1).
Is Guinsoo's rage supposed to be UNIQUE or is it supposed to stack?