The problem is not one of requiring ManagedPropertys to have mutable MetaValues, its
knowing how to create a valid MetaValue from a MetaType. Having a MetaValue produced from
a MetaType still requires casting to the correct concrete implementation to obtain the
ability to set the value. At that point you still have to have a "valid" value,
so I guess there is no magic other than having to know the various MetaTypes/MetaValues
such that the existing MetaValueFctory.create(Object value) is sufficient.
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