Method writeUInt

Fleece/Core/Encoder.cc:264–264

    void Encoder::writeInt(int64_t i)   {writeInt(i, (i < 2048 && i >= -2048), false);}
    void Encoder::writeUInt(uint64_t i) {writeInt(i, (i < 2048),               true);}

    void Encoder::writeDouble(double n) {
        throwIf(std::isnan(n), InvalidData, "Can't write NaN");