docs: public Bits bitwiseXor(final Bits right) {
      final int lengthDifference = this.bitLength - right.bitLength;
      if (lengthDifference < 0) {
        return this.concatenate(
          new Bits(0l, -lengthDifference)).bitwiseXor(right);
      }
      if (lengthDifference > 0) {
        return this.bitwiseXor(right
          .concatenate(new Bits(0l, lengthDifference)));
      }
      final Bits returnValue = new Bits(
        new byte[this.bytes.length],
        this.bitLength);
      for (int i = 0; i < this.bytes.length; i++) {
        returnValue.bytes[i] = this.bytes[i];
      }
      for (int i = 0; i < right.bytes.length; i++) {
        returnValue.bytes[i] ^= right.bytes[i];
      }
      return returnValue;
    }