Cho'Gath stacks aren't really Infinite like claimed

I did some testing with Chogath.... His passive caps out at the good ol 255 instead of ∞. Why Riot, why you lie to me? I is Cho main from Season 4.2 to 6.9 and I wants to be back to League after ruining of our lord and saviour URF was crippled beyond recognition but now I am much disappoint. My other Lord of aerial mobility and noodly goodness, please save us all! . . . Or Riot. That works too.[slayer-pantheon-thumbs]

EDIT: Oh yeah the proof is the last two pics in which you can see my dragon counter increasing but not my actual stack count. The rest are just testing how long it took me to die and how much dmg hp scaling things do.