// encryption metadata.
func cleanMinioInternalMetadataKeys(metadata map[string]string) map[string]string {
	newMeta := make(map[string]string, len(metadata))
	for k, v := range metadata {
		if strings.HasPrefix(k, "X-Amz-Meta-X-Minio-Internal-") {
			newMeta[strings.TrimPrefix(k, "X-Amz-Meta-")] = v
		} else {
			newMeta[k] = v
		}
	}
	return newMeta
}

	len := runtime.Callers(3, pcs[:])
	frames := runtime.CallersFrames(pcs[:len])
	for i := 0; i < len; i++ {
		// second return value is "more", not "ok"
		frame, _ := frames.Next()
		if (!strings.HasPrefix(frame.File, gormSourceDir) ||
			strings.HasSuffix(frame.File, "_test.go")) && !strings.HasSuffix(frame.File, ".gen.go") {
			return string(strconv.AppendInt(append([]byte(frame.File), ':'), int64(frame.Line), 10))
		}
	}