Yang Data Codec Gson: failed to lookup prefix when serializing identityref type

Identityref values fail to deserialize if only name of identity is provided without prefix.

example of json restcong input that fails (toaster sample):
{
"input" :

{ "toasterDoneness" : "10", "toasterToastType":"wheat-bread" //this value fails to deserialize }

}

According to specification we should be able to deserialize this value without prefix, if identity that is referenced is defined in the same module as other data. This input works in Helium. In Lithium it only works if payload is specified in XML.