Remove constrains on variable unit

packages/extractor/openfisca_json_extractor/variables.py

@@ -184,11 +184,6 @@ class VariablesExporter:
             elif key == "unit":
                 if value is not None:
                     assert isinstance(value, str)
-                    assert value in (
-                        "currency",
-                        "months",
-                        "years",
-                    ), value
                     export[key] = value
             elif key == "value_type":
                 assert value in (bool, datetime.date, float, int, str) or issubclass(