A property value that is a (model) element. Will detect when children are moved, added, deleted and sends the appropriate deltas.
parent is the structure that the value of this property attaches to,
so e.g. for all values
item of Part(List)Property we (should) have the invariant:
item.container === this.parent.
initialValue is default value except parts and GUID-typed primitives. (by-id/name references do not have default values.)
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