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Abstract interfaces are encoded as a union with a boolean discriminator. The union has an object reference
(see Section 15.3.6, “Object References,? on page 15-30) if the
discriminator is TRUE, and a value type
(see Section 15.3.4, “Value Types,? on
page 15-15) if the discriminator is
FALSE. The encoding of value types marshaled as abstract interfaces always includes RepositoryId information. If there is
no indication whether a nil abstract interface represents a nil object reference or a null valuetype, it shall be encoded
as a null valuetype.