Fix type checking when casting (#30)

Author: davidbrochart

jupyter_ydoc/utils.py

@@ -4,13 +4,13 @@
 def cast_all(o: Union[List, Dict], from_type, to_type) -> Union[List, Dict]:
     if isinstance(o, list):
         for i, v in enumerate(o):
-            if isinstance(v, from_type):
+            if type(v) == from_type:
                 o[i] = to_type(v)
             elif isinstance(v, (list, dict)):
                 cast_all(v, from_type, to_type)
     elif isinstance(o, dict):
         for k, v in o.items():
-            if isinstance(v, from_type):
+            if type(v) == from_type:
                 o[k] = to_type(v)
             elif isinstance(v, (list, dict)):
                 cast_all(v, from_type, to_type)