@NonNull
    @Override
    public MutableArray setNumber(int index, Number value) {
        return setValue(index, value);
    }
@ NonNull @ Override public MutableArray setNumber ( int index , Number value ) { return setValue ( index , value ) ; }
Sets an NSNumber object at the given index.

@param index the index. This value must not exceed the bounds of the array.
@param value the Number object
@return The self object