Make punching enities using a cushion deal 0 damage for pillow fights

Absolutely love the new addition of cushions as a means of sitting!! An idea I had for them is work like pillows in real life and be harmless to mobs/players when you hit them. This would allow you to punch your friends and mobs without risk of killing them, whether its to knock them away for fun, keep certain mobs from being to hurt you, or to have play fights without dealing damage to armour, I believe this feature would be a very welcome addition! It would act just like a normal punch with your fist, but to indicate you're not dealing any damage it could have a special effect like feathers flying out or a cushiony/wooly type sound.