More copy

src/cattrs/converters.py

@@ -1,5 +1,6 @@
 from collections import Counter
 from collections.abc import MutableSet as AbcMutableSet
+from copy import deepcopy
 from dataclasses import Field
 from enum import Enum
 from functools import lru_cache
@@ -309,7 +310,8 @@ def _unstructure_enum(self, obj):
         """Convert an enum to its value."""
         return obj.value
 
-    def _unstructure_identity(self, obj):
+    @staticmethod
+    def _unstructure_identity(obj):
         """Just pass it through."""
         return obj
 
@@ -643,8 +645,8 @@ def copy(
             else self.detailed_validation,
         )
 
-        res._unstructure_func = self._unstructure_func.copy(res._unstructure_identity)
-        res._structure_func = self._structure_func.copy(BaseConverter._structure_error)
+        res._unstructure_func = deepcopy(self._unstructure_func)
+        res._structure_func = deepcopy(self._structure_func)
 
         return res
 
@@ -905,8 +907,8 @@ def copy(
             else self.detailed_validation,
         )
 
-        res._unstructure_func = self._unstructure_func.copy(res._unstructure_identity)
-        res._structure_func = self._structure_func.copy(BaseConverter._structure_error)
+        res._unstructure_func = deepcopy(self._unstructure_func)
+        res._structure_func = deepcopy(self._structure_func)
 
         return res
 

src/cattrs/dispatch.py

@@ -90,8 +90,8 @@ def clear_cache(self):
         self._direct_dispatch.clear()
         self.dispatch.cache_clear()
 
-    def copy(self, fallback_func):
-        res = self.__class__(fallback_func)
+    def __deepcopy__(self, _):
+        res = self.__class__(None)
         res._function_dispatch = deepcopy(self._function_dispatch)
         res._single_dispatch = deepcopy(self._single_dispatch)
         return res

tests/test_copy.py

@@ -1,6 +1,5 @@
 from collections import OrderedDict
 from copy import deepcopy
-from re import S
 from typing import Callable, Type
 
 from attr import define