Method removeAll

Fleece/Mutable/MutableDict.hh:47–47

        void remove(slice key)                              {heapDict()->remove(key);}
        void removeAll()                                    {heapDict()->removeAll();}

        /** Promotes an Array value to a MutableArray (in place) and returns it.
            Or if the value is already a MutableArray, just returns it. Else returns null. */