Cache the model serde

Author: igalshilman

pydantic_ai_slim/pydantic_ai/durable_exec/restate/_model.py

@@ -7,11 +7,13 @@
 from pydantic_ai.models import Model
 from pydantic_ai.models.wrapper import WrapperModel
 
+MODEL_RESPONSE_SERDE = PydanticTypeAdapter(ModelResponse)
+
 
 class RestateModelWrapper(WrapperModel):
     def __init__(self, wrapped: Model, context: Context, max_attempts: int | None = None):
         super().__init__(wrapped)
-        self.options = RunOptions[ModelResponse](serde=PydanticTypeAdapter(ModelResponse), max_attempts=max_attempts)
+        self.options = RunOptions(serde=MODEL_RESPONSE_SERDE, max_attempts=max_attempts)
         self.context = context
 
     async def request(self, *args: Any, **kwargs: Any) -> ModelResponse: