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d1aeea2c3e
* fix(gateway): stop persisting Overwrite wrappers into empty reducer channels on branch Thread branching (and POST /state on a never-written channel) wraps copied reducer values in Overwrite. Upstream BinaryOperatorAggregate.update seeds an empty (MISSING) channel with values[0] verbatim without unwrapping, so Union-typed channels (sandbox/goal/todos/promoted) stored the wrapper literally and the next consumer crashed with TypeError: 'Overwrite' object is not subscriptable (#4380). Patch the channel to unwrap the first write (mirroring DeltaChannel semantics), and stop copying thread-scoped channels (sandbox, thread_data) into branches: the parent's sandbox_id would bind the branch to the parent's workspace and release lifecycle. * refactor(checkpoint): drop private _get_overwrite import for a local Overwrite check Importing langgraph's underscored _get_overwrite at module top level meant an upstream refactor that drops it - plausibly the same release that fixes the bug - would fail this module's import and crash startup before the probe can stand the patch down. Replace it with a local helper on the public Overwrite type, and fix two test docstring nits. * refactor(checkpoint): write patch flags via their constants to avoid drift Both saver patches read their "already patched" idempotence flag through a module constant (_PATCH_FLAG / _BINOP_PATCH_FLAG) but wrote it as a hard-coded attribute literal, so renaming the constant would silently break the guard and double-apply the patch. Write via the same constant (setattr), dropping the now-unneeded attr-defined ignores. --------- Co-authored-by: Willem Jiang <willem.jiang@gmail.com>