Use 0 for zero value json.Number and check against empty string

_generated/def.go

@@ -305,4 +305,5 @@ type NumberJSONSample struct {
 	Single json.Number
 	Array  []json.Number
 	Map    map[string]json.Number
+	OE     json.Number `msg:",omitempty"`
 }

gen/elem.go

@@ -729,7 +729,7 @@ func (s *BaseElem) ZeroExpr() string {
 	case Time:
 		return "(time.Time{})"
 	case JsonNumber:
-		return "(json.Number{})"
+		return `""`
 
 	}
 

msgp/read.go

@@ -1306,11 +1306,6 @@ func (m *Reader) ReadJSONNumber() (n json.Number, err error) {
 			return json.Number(strconv.FormatFloat(v, 'f', -1, 64)), nil
 		}
 		return "", err
-	case StrType:
-		v, err := m.ReadString()
-		if err == nil {
-			return json.Number(v), nil
-		}
 	}
 	return "", TypeError{Method: NumberType, Encoded: t}
 }

msgp/read_bytes.go

@@ -1348,9 +1348,5 @@ func ReadJSONNumberBytes(b []byte) (number json.Number, o []byte, err error) {
 	if err == nil {
 		return json.Number(strconv.FormatFloat(f, 'f', -1, 64)), o, nil
 	}
-	s, o, err := ReadStringBytes(b)
-	if err == nil {
-		return json.Number(s), o, nil
-	}
 	return "", nil, TypeError{Method: NumberType, Encoded: getType(b[0])}
 }

msgp/write.go

@@ -638,8 +638,8 @@ func (mw *Writer) WriteTime(t time.Time) error {
 // WriteJSONNumber writes the json.Number to the stream as either integer or float.
 func (mw *Writer) WriteJSONNumber(n json.Number) error {
 	if n == "" {
-		// Allow writing the empty string to cover the zero value.
-		return mw.push(wfixstr(uint8(0)))
+		// The zero value outputs the 0 integer.
+		return mw.push(0)
 	}
 	ii, err := n.Int64()
 	if err == nil {

msgp/write_bytes.go

@@ -470,8 +470,8 @@ func AppendIntf(b []byte, i interface{}) ([]byte, error) {
 // An error will be returned if the json.Number returns error as both integer and float.
 func AppendJSONNumber(b []byte, n json.Number) ([]byte, error) {
 	if n == "" {
-		// Allow writing the empty string to cover the zero value.
-		return append(b, mfixstr), nil
+		// The zero value outputs the 0 integer.
+		return append(b, 0), nil
 	}
 	ii, err := n.Int64()
 	if err == nil {