Remove need to be serialisable when insntantiating encoder or decoder…

… explicitly in the code

chili/decoder.py

@@ -472,7 +472,7 @@ def build_type_decoder(a_type: Type, extra_decoders: TypeDecoders = None, module
         return TypedDictDecoder(origin_type, extra_decoders)
 
     if is_class(origin_type) and is_user_string(origin_type):
-        return ProxyDecoder[origin_type](origin_type)
+        return ProxyDecoder[origin_type](origin_type)  # type: ignore
 
     if origin_type is Union:
         type_args = get_type_args(a_type)

chili/typing.py

@@ -117,6 +117,7 @@ def is_typed_dict(type_name: Type) -> bool:
 def is_user_string(type_name: Type) -> bool:
     return issubclass(type_name, UserString)
 
+
 def map_generic_type(type_name: Any, type_map: Dict[Any, Any]) -> Any:
     if not type_map:
         return type_name

tests/test_decoder.py

@@ -16,14 +16,3 @@ class Example:
     # then
     assert isinstance(instance, Decoder)
     assert instance.__generic__ == Example
-
-
-def test_fail_encode_non_encodable_type() -> None:
-    # given
-    class Example:
-        name: str
-        age: int
-
-    # when
-    with pytest.raises(DecoderError.invalid_type):
-        Decoder[Example]()

tests/usecases/userstring_test.py

@@ -21,6 +21,7 @@ def test_can_decode_userstring() -> None:
     # given
     class ComplexString(UserString):
         pass
+
     string = "Example String"
 
     # when