OP armament command in minecraft is not working?

I have entered in minecraft following command:

/ give @p minecraft: leather_chestplate {AttributeModifiers: [{AttributeName: "generic.armorToughness", Name: "generic.armorToughness", Slot: "chest", Amount: 100000000, Operation: 0, UUIDMost: 36925, UUIDLeast: 183522} , {AttributeName: "generic.armor", Name: "generic.armor", Slot: "chest", Amount: 100000000, Operation: 0, UUIDMost: 12460, UUIDLeast: 126231}]} 1

I got a leather jacket with a worth of 100000000 armor and an armor hardness of 100000000, which protects more than a normal leather jacket, but not as strong as one might expect at such high values, a zombie with a normal diamond sword makes 2 up to 2 and a half heart damage per stroke, with such high values one should be able to expect complete invulnerability through normal attacks or am I wrong? Maybe you know what it could be, or how you can give a leather jacket by command, which makes one against normal attacks 100% immune? (Or 99.9999999999999

%, is synonymous )

Maybe the value is just too high, they are simply ignored by Minecraft.

Hmm… I've set the value down a bit, and it's not really ignored, I only get half heart damage from a zombie with a diamond sword, but no matter if I make an armor worth 100 or 5000000, I always get half heart Damage, but I would like to create a breastplate that will make you completely immune to damage that normal (enchanted) armor could prevent