Fix register_struc_hook

Author: jwsloan

tests/test_cats.py

@@ -113,3 +113,19 @@ class Foo:
         Foo.struc(dict(union=dict(a="some_value")))
     except Exception as exc:
         raise AssertionError(f"Exception {repr(exc)} was raised when it should not have been.")
+
+
+
+
+def test_struc_with_typed_dict_registered_hook():
+    from typing_extensions import TypedDict
+    class Foo(TypedDict):
+        bar: int
+
+    register_struc_hook(Foo, lambda x, _: x)
+
+    @Cat
+    class Thing:
+        a: bool
+
+    Thing.struc(dict(a=True))

typecats/tc.py

@@ -117,9 +117,9 @@ def get_default_converter():
     return _TYPECATS_DEFAULT_CONVERTER
 
 
-def register_struc_hook(*args, **kwargs):
+def register_struc_hook(typ, func, **_):
     """Use this to register cattrs structuring hooks on the internal cattrs Converter"""
-    _TYPECATS_DEFAULT_CONVERTER.register_structure_hook(*args, **kwargs)
+    _TYPECATS_DEFAULT_CONVERTER.register_structure_hook_func(lambda t: t == typ, func)
 
 
 def register_unstruc_hook(*args, **kwargs):