Returns true if the DynValueCommon represents a null value type.
Changes the representation of a DynValueCommon to a null value type.
Replaces a null value type with a newly constructed value. Its components are initialized
to default values as in DynAnyFactory.create_dyn_any_from_type_code.
If the DynValueCommon represents a non-null value type, then this operation has no effect.
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