Use PathTypeHandler's for function objects with non-default properties/attributes. Move from creating new non-shared SimpleTypeHandler's when a new property is added to a SimpleTypeHandler, or an attribute is changed, to creating PathTypeHandler's. Build a new root and evolve from the root to the current state of the SimpleTypeHandler, then replace the type's existing SimpleTypeHandler with the new PathTypeHandler. From there, we can evolve to the state required by the new property/attribute, and future instances of the same function that make the same type transition will get the same type. Also fix up some shared SimpleTypeHandler's in the library that didn't represent the desired state of their library objects and were forcing type transitions during initialization.