langchain

fb6108c8 - core[patch]: In astream_events(version=v2) tap output of root run (#21977)

core[patch]: In astream_events(version=v2) tap output of root run (#21977) - if tap_output_iter/aiter is called multiple times for the same run issue events only once - if chat model run is tapped don't issue duplicate on_llm_new_token events - if first chunk arrives after run has ended do not emit it as a stream event --------- Co-authored-by: Eugene Yurtsev <eyurtsev@gmail.com>