Slime's still damage you on NoAI

I was making a little boss fight and discovered that Slimes with

{NoAI:1}

Still damage you on contact, however all other features of NoAI still works fine.

How to reproduce:

/summon Slime ~ ~ ~

{NoAI:1}

The slime will float and do it's NoAI-ish things but will hurt you upon contact. No other mob has this functionality.

You can tell it hurts by the new feature Mojang added that displays the amount of damage taken.