Assignment to a list property emits property change event for every item in the list

To reproduce, run attached example and click "Replace lists"

It will output change to the targetList1 property as many times as there are items in the list of items that is assigned, instead of just a single change event when the whole list changes.

This behavior easily causes performance issues if the property is used with Repeater as it causes items to be recreated as many times as there are items in the list.