Expression-Language

LangChain Expression Language crashes on pydantic v2 inputs Hooked a simple chain into LEL: from langchain_experimental.expression_language import chain from pydantic import BaseModel class Input(BaseModel): q: str result = chain("{q}").run(Input(q="hi")) Traceback: AttributeError: 'str' object has no attribute 'model_dump' Python 3.12.1, langchain 0.3.0, expression-language 0.0.5, pydantic 2.8.2. Same code worked with pydantic 1.10.