Polymorphism of Task.input.value[x] incorrect?

[reinkrul]

When marshalling a Task with input (type TaskInput) set, it marshals all empty fields as well. I see that this works for Observation, as the value options are defined as pointers (with omitempty).

I'm somewhat new to FHIR, but if you point me to the right direction I can give it a go fixing it (thanks in advance).

For example, the following test:

func TestMarshalTask(t *testing.T) {
	task := Task{}
	task.Input = []TaskInput{
		{
			ValueInteger: 5,
		},
	}
	data, _ := json.MarshalIndent(task, "", "  ")
	println(string(data))
}

gives:

{
  "status": "draft",
  "intent": "",
  "input": [
    {
      "type": {},
      "valueBase64Binary": "",
      "valueBoolean": false,
      "valueCanonical": "",
      "valueCode": "",
      "valueDate": "",
      "valueDateTime": "",
      "valueDecimal": 0,
      "valueID": "",
      "valueInstant": "",
      "valueInteger": 5,
      "valueMarkdown": "",
      "valueOid": "",
      "valuePositiveInt": 0,
      "valueString": "",
      "valueTime": "",
      "valueUnsignedInt": 0,
      "valueUri": "",
      "valueUrl": "",
      "valueUuid": "",
      "valueAddress": {},
      "valueAge": {},
      "valueAnnotation": {
        "text": ""
      },
      "valueAttachment": {},
      "valueCodeableConcept": {},
      "valueCoding": {},
      "valueContactPoint": {},
      "valueCount": {},
      "valueDistance": {},
      "valueDuration": {},
      "valueHumanName": {},
      "valueIdentifier": {},
      "valueMoney": {},
      "valuePeriod": {},
      "valueQuantity": {},
      "valueRange": {},
      "valueRatio": {},
      "valueReference": {},
      "valueSampledData": {
        "origin": {},
        "period": 0,
        "dimensions": 0
      },
      "valueSignature": {
        "type": null,
        "when": "",
        "who": {}
      },
      "valueTiming": {},
      "valueContactDetail": {},
      "valueContributor": {
        "type": "author",
        "name": ""
      },
      "valueDataRequirement": {
        "type": ""
      },
      "valueExpression": {
        "language": ""
      },
      "valueParameterDefinition": {
        "use": "in",
        "type": ""
      },
      "valueRelatedArtifact": {
        "type": "documentation"
      },
      "valueTriggerDefinition": {
        "type": "named-event"
      },
      "valueUsageContext": {
        "code": {},
        "valueCodeableConcept": {},
        "valueQuantity": {},
        "valueRange": {},
        "valueReference": {}
      },
      "valueDosage": {},
      "valueMeta": {}
    }
  ],
  "resourceType": "Task"
}