Also remove preprocess_dict method which is unused

Signed-off-by: Adam Glustein <Adam.Glustein@Point72.com>

Author: AdamGlustein

csp/impl/struct.py

@@ -120,10 +120,6 @@ def _obj_to_python(cls, obj):
         else:
             return obj
 
-    @classmethod
-    def _preprocess_dict_from_python(cls, d):
-        return d
-
     @classmethod
     def _obj_from_python(cls, json, obj_type):
         obj_type = ContainerTypeNormalizer.normalize_type(obj_type)
@@ -148,7 +144,6 @@ def _obj_from_python(cls, json, obj_type):
         elif issubclass(obj_type, Struct):
             if not isinstance(json, dict):
                 raise TypeError("Representation of struct as json is expected to be of dict type")
-            json = obj_type._preprocess_dict_from_python(json)
             res = obj_type()
             for k, v in json.items():
                 expected_type = obj_type.__full_metadata_typed__.get(k, None)