Hello, 

I am experiencing a weird behavior from JsInterop in this project: 
gwty-leafle <https://github.com/gwidgets/gwty-leaflet>t. The Map 
<https://github.com/gwidgets/gwty-leaflet/blob/master/src/main/java/com/gwidgets/api/leaflet/Map.java>
 
class has a zoomIn(Number delta) method that is supposed to zoom in the map 
with the specified delta. This method works fine in javascript: 

var mymap = L.map('map', {
         
    center: [51.505, -0.09],
    zoom: 13,
    minZoom: 5,
    maxZoom: 400
       }
     );

      console.log(mymap.getZoom());
      console.log(mymap.getMinZoom());
      console.log(mymap.getMaxZoom());


      mymap.zoomIn(20);

      // Give 33
      console.log("after zoom" + mymap.getZoom()); 

However, in the JsInterop version the result is different, and after using 
zoomIn() with any delta, the zoom jumps directly to the maxZoom value which 
is odd: 

LeafletResources.whenReady(
 e -> 
             {  
 //Map options required values: center point, zoom, and a min zoom 
    MapOptions options = new MapOptions.Builder(L.latLng(51.505, -0.09), 13, 
5)
                           .maxZoom(400).build();
 
 final Map map = L.map("map", options);
 
 //Same as javascript
 GWT.log(map.getZoom());
 GWT.log(map.getMinZoom());
 GWT.log(map.getMaxZoom());
      
 map.zoomIn(33, null);


 // result is 400 -> jumps straight to maxZoom 
 GWT.log("after zoom"+map.getZoom());
});

The same thing happens with the Transformation 
<https://github.com/gwidgets/gwty-leaflet/blob/master/src/test/java/com/gwidgets/leaflet/test/TransformationTest.java>
 
class. 


Any help is much appreciated. 

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