It is not natural for Pinocchio to be able to stay under water for 50 minutes (as he does when the buyer throws him -- as a donkey -- into the ocean to drown him). If he had human lungs they would fill up with water.

Collodi does not give the reader any details about the workings of Pinocchio's internal system ----Pinocchio is, after all, a puppet by design -- whereas Villiers de L'Isle Adam does. (See description of Edison's Hadaly.) Hadaly's lungs are made of a golden phonograph. Her impermeable skin keeps her insides from getting wet.