Merge pull request 'fix(api): document dispose_engine lazy import + regression test (CAR-1135)' (#45) from barcode-betty/fix-car-1135-dispose-engine into dev

src/cartsnitch_api/cache.py

@@ -40,7 +40,7 @@ class CacheClient:
             return None
         if isinstance(value, bytes):
             return value.decode("utf-8", errors="replace")
-        return value
+        return str(value)
 
     async def set(self, key: str, value: str, ttl_seconds: int = 300) -> None:
         if not self._client: