Method gives a different result than Javascript after wrapping it using JsInterop.

Hello, 

I am experiencing a weird behavior from JsInterop in this project: gwty-leaflet. The Map 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 class. 

Any help is much appreciated. 

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