langchain

4c2e8872 - core: Simplify astream logic in BaseChatModel and BaseLLM (#19332)

core: Simplify astream logic in BaseChatModel and BaseLLM (#19332) Covered by tests in `libs/core/tests/unit_tests/language_models/chat_models/test_base.py`, `libs/core/tests/unit_tests/language_models/llms/test_base.py` and `libs/core/tests/unit_tests/runnables/test_runnable_events.py`