Autogenerated MarshalJSON function does not respect ordering

[galion96]

Hello,

I am using this library as a validator before streaming data to PubSub, and since avro requires a strict order I assumed that
MarshalJSON is ment to respect that ordering, and the method does seem to do some only to call json.Marhsal in the end and ruin the order.
Is this intended?
Code example that was autogenerated from avro schema-

function(r SomeStruct) MarshalJSON() ([]byte, error) {
	var err error
	output := make(map[string]json.RawMessage)
	output["filedA"], err = json.Marshal(r.fieldA)
	if err != nil {
		return nil, err
	}
	output["fieldB"], err = json.Marshal(r.fieldB)
	if err != nil {
		return nil, err
	}
	output["fieldC"], err = json.Marshal(r.fieldC)
	if err != nil {
		return nil, err
	}
	output["fieldD"], err = json.Marshal(r.fieldD)
	if err != nil {
		return nil, err
	}
	output["fieldE"], err = json.Marshal(r.fieldE)
	if err != nil {
		return nil, err
	}
	return json.Marshal(output)

Is this intended?