Method setNull

API/fleece/Mutable.hh:119–119

        Slot set(uint32_t i)                    {return Slot(FLMutableArray_Set(*this, i));}
        void setNull(uint32_t i)                {set(i).setNull();}

        template <class T>
        void set(uint32_t i, T v)               {set(i) = v;}