verifyEncoding = (encoding, label) => {
      !encoding.match(rC0) ||
        Fail`${b(
          label,
        )} encoding must not contain a C0 control character: ${encoding}`;
      const decoded = decodeCompactArray(`^v ${encoding} v `, liberalDecode);
      (isArray(decoded) &&
        decoded.length === 3 &&
        decoded[0] === null &&
        decoded[2] === null) ||
        Fail`${b(label)} encoding must be embeddable: ${encoding}`;
    }
@param {string} encoding
@param {string} label
@returns {void}