rlp: add support for boolean encoding/decoding

rlp/encode.go

@@ -361,6 +361,8 @@ func makeWriter(typ reflect.Type) (writer, error) {
 		return writeBigIntNoPtr, nil
 	case isUint(kind):
 		return writeUint, nil
+	case kind == reflect.Bool:
+		return writeBool, nil
 	case kind == reflect.String:
 		return writeString, nil
 	case kind == reflect.Slice && isByte(typ.Elem()):
@@ -398,6 +400,15 @@ func writeUint(val reflect.Value, w *encbuf) error {
 	return nil
 }
 
+func writeBool(val reflect.Value, w *encbuf) error {
+	if val.Bool() {
+		w.str = append(w.str, 0x01)
+	} else {
+		w.str = append(w.str, 0x80)
+	}
+	return nil
+}
+
 func writeBigIntPtr(val reflect.Value, w *encbuf) error {
 	ptr := val.Interface().(*big.Int)
 	if ptr == nil {