by StormKnight
In any case, under "Effects of Tokyo" it states, "the Monster in Tokyo cannot use the [Heart] result on the dice to heal (but can heal using cards)."
This matches the French original rules, and I agree that this rule would let you use hearts to remove shrink ray tokens while in Tokyo.
We've been playing that hearts in Tokyo let you do anything EXCEPT heal, so you can use them to get rid of shrink or poison or to gain power-up cards. It's worked fine so far. :)