Generalize pointer to string uuid transcoding to any non-varchar/text type

conn.go

@@ -728,7 +728,7 @@ func (c *Conn) sendPreparedQuery(ps *PreparedStatement, arguments ...interface{}
 		switch arg := arguments[i].(type) {
 		case Encoder:
 			wbuf.WriteInt16(arg.FormatCode())
-		case string:
+		case string, *string:
 			wbuf.WriteInt16(TextFormatCode)
 		default:
 			switch oid {
@@ -776,7 +776,7 @@ func (c *Conn) sendPreparedQuery(ps *PreparedStatement, arguments ...interface{}
 				err = encodeFloat4(wbuf, arguments[i])
 			case Float8Oid:
 				err = encodeFloat8(wbuf, arguments[i])
-			case TextOid, VarcharOid, UuidOid:
+			case TextOid, VarcharOid:
 				err = encodeText(wbuf, arguments[i])
 			case DateOid:
 				err = encodeDate(wbuf, arguments[i])
@@ -811,7 +811,11 @@ func (c *Conn) sendPreparedQuery(ps *PreparedStatement, arguments ...interface{}
 			case JsonOid, JsonbOid:
 				err = encodeJson(wbuf, arguments[i])
 			default:
-				return SerializationError(fmt.Sprintf("Cannot encode %T into oid %v - %T must implement Encoder or be converted to a string", arg, oid, arg))
+				if s, ok := arguments[i].(string); ok {
+					err = encodeText(wbuf, s)
+				} else {
+					return SerializationError(fmt.Sprintf("Cannot encode %T into oid %v - %T must implement Encoder or be converted to a string", arg, oid, arg))
+				}
 			}
 		}
 		if err != nil {

values_test.go

@@ -199,20 +199,29 @@ func mustParseCIDR(t *testing.T, s string) net.IPNet {
 	return *ipnet
 }
 
-func TestUuidTranscode(t *testing.T) {
+func TestStringToNotTextTypeTranscode(t *testing.T) {
 	t.Parallel()
 
 	conn := mustConnect(t, *defaultConnConfig)
 	defer closeConn(t, conn)
 
 	input := "01086ee0-4963-4e35-9116-30c173a8d0bd"
+
 	var output string
-	err := conn.QueryRow("select $1::uuid", &input).Scan(&output)
+	err := conn.QueryRow("select $1::uuid", input).Scan(&output)
 	if err != nil {
 		t.Fatal(err)
 	}
 	if input != output {
-		t.Errorf("uuid: Did not transcode successfully: %s is not %s", input, output)
+		t.Errorf("uuid: Did not transcode string successfully: %s is not %s", input, output)
+	}
+
+	err = conn.QueryRow("select $1::uuid", &input).Scan(&output)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if input != output {
+		t.Errorf("uuid: Did not transcode pointer to string successfully: %s is not %s", input, output)
 	}
 }