Method writeDouble

Fleece/Support/JSONEncoder.hh:52–52

        void writeUInt(uint64_t i)              {_writeInt("%llu", i);}
        void writeFloat(float f)                {_writeFloat(f);}
        void writeDouble(double d)              {_writeFloat(d);}

        void writeString(const std::string &s)  {writeString(slice(s));}
        void writeString(slice s);