Type (for before it's the type after deducing how it's used, it was not defined yet) :
```
before def origin_visit_add(self, origin: str, date: Union[str, datetime.datetime], type: str) -> Optional[Dict[str, Union[str, int]]]:
after def origin_visit_add(self, origin_url: str, date: Union[str, datetime.datetime], type: str) -> OriginVisit:
```
Impacts:
- swh-loader-core (runtime)
- swh-loader-svn (runtime)
- swh-journal (tests)
- swh-web (tests)
- swh-indexer (tests)
Depends on D2813