Refactor Type to be an int

internal/compiler/bytecode.go

@@ -67,8 +67,7 @@ func (e *encoder) WriteValue(data any) error {
 
 func (e *encoder) WriteObjects(objs ...object.Object) (err error) {
 	for _, obj := range objs {
-		err = errors.Join(err, e.WriteValue(len(string(obj.Type()))))
-		err = errors.Join(err, e.WriteString(string(obj.Type())))
+		err = errors.Join(err, e.WriteValue(obj.Type()))
 
 		switch o := obj.(type) {
 		case *object.Null:
@@ -145,16 +144,16 @@ func (d *decoder) String(len int) (s string) {
 
 func (d *decoder) Objects(len int) (o []object.Object) {
 	for i := 0; i < len; i++ {
-		switch t := d.String(d.Int()); t {
-		case object.NULL_OBJ:
+		switch t := object.Type(d.Int()); t {
+		case object.NullType:
 			o = append(o, &object.Null{})
-		case object.BOOLEAN_OBJ:
+		case object.BooleanType:
 			o = append(o, &object.Boolean{Value: d.Byte() == 1})
-		case object.INTEGER_OBJ:
+		case object.IntegerType:
 			o = append(o, &object.Integer{Value: d.Int64()})
-		case object.STRING_OBJ:
+		case object.StringType:
 			o = append(o, &object.String{Value: d.String(d.Int())})
-		case object.COMPILED_FUNCTION_OBJ:
+		case object.CFunctionType:
 			// The order of the fields has to reflect the data layout in the encoded bytecode.
 			o = append(o, &object.CompiledFunction{
 				NumParameters: d.Int(),
@@ -162,7 +161,7 @@ func (d *decoder) Objects(len int) (o []object.Object) {
 				Instructions:  d.Bytes(d.Int()),
 			})
 		default:
-			panic(fmt.Sprintf("decoder: unsupported decoding for type %s", t))
+			panic(fmt.Sprintf("decoder: unsupported decoding for type %d", t))
 		}
 	}
 	return