Google App Engine - Will the Id of a datastore entity ever be negative?

Question

Will the Id of a datastore entity ever be negative? Or are they guaranteed to be positive numbers?

Answer 1

I cannot find a doc stating it explicitly, but I have never seen one that is negative. The docs do say that id's generally increase as new entities are created. (But they should not be relied upon to be strictly so, as you might get id's slightly out of order, like 10,11,13,12,14)