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Sydney RunkleandGitHub
1b5ca0a1b1
Add a `type: Literal["__overwrite__"]` discriminator field to
`Overwrite` and teach `_get_overwrite()` to recognise the
dataclass-erased `{"value": ..., "type": "__overwrite__"}` form. This
keeps `Overwrite` semantics intact across JSON boundaries that strip
dataclass types (e.g. `langgraph-api.serde.json_dumpb`), without
requiring callers to switch to the dict sentinel form.
This was an oversight in the initial `Overwrite` implementation, it
should be json serializable out of the box.
Fixing langchain-ai/deepagents#3789