code: public static void encode(Appendable out, int value)
        throws IOException {
      value = toVLQSigned(value);
      do {
        int digit = value & VLQ_BASE_MASK;
        value >>>= VLQ_BASE_SHIFT;
        if (value > 0) {
          digit |= VLQ_CONTINUATION_BIT;
        }
        out.append(Base64.toBase64(digit));
      } while (value > 0);
    }
docs: Writes a VLQ encoded value to the provide appendable.
  @throws IOException