} else {
				s += ", \"bitrot_valid\": false"
			}
			if value {
				if utf8.Valid(data) {
					// Encode as JSON string.
					b, err := json.Marshal(string(data))
					if err == nil {
						s += `, "data_string": ` + string(b)
					}
				}
				// Base64 encode.
				s += `, "data_base64": "` + base64.StdEncoding.EncodeToString(data) + `"`
			}
			s += "}"
		}
		res = append(res, []byte(s)...)
	}