[Mickey42302]

I would like to suggest adding these patches to Paper. At present, there is an integer overflow exploit with potions. This is often used by trolls to create "Instant Kill" potions. These potions can kill any player, even in Creative mode.

This patch corrects the integer overflow, which makes it so that the "Instant Kill" potions no longer work.

[lynxplay]

Thank you for the PR but I don't see much need in patching this.
There are much worse things creative mode players can do to a server than killing a creative mode player.

If we wanted to patch this, the place would be in the computation of the amplifier by making it overflow save instead of limiting this.
But yea, I don't think this is a useful change. Creative mode is creative mode. Whatever plugin creative mode servers use to limit items should probably try to limit this if they care for it.