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ref https://github.com/langchain-ai/langchainjs/pull/9665 Fixes trace persistence for iterator/generator inputs (like `RunnableGenerator`) where the full input isn't available at chain start. Instead of POSTing a run with incomplete inputs on start and PATCHing later, this defers the POST until chain end when inputs are fully realized. --------- Co-authored-by: Mason Daugherty <github@mdrxy.com>