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releasing 1.2.1 Notable changes since 1.2.0: - feat(langgraph): add `before_builtins` opt-in for stream transformers (#7882) - fix(langgraph): keep tool results out of v3 messages (#7838) - chore(deps): bump langsmith from 0.7.31 to 0.8.0 (#7788) - chore(deps): bump idna from 3.11 to 3.15 (#7866)