Coordinate validation should return floats

Conengmo · Conengmo · commit 2bfd656de03c · 2019-03-17T20:08:09.000+01:00
If Numpy int32's are returned the `tojson` filter doesn't work.
diff --git a/folium/utilities.py b/folium/utilities.py
@@ -62,7 +62,7 @@ def _iter_tolist(x):
     if hasattr(x, '__iter__'):
         return list(map(_iter_tolist, x))
     else:
-        return x
+        return float(x)
 
 
 def _flatten(container):
