fix: honor checkpointer.serde.allowed_msgpack_modules in langgraph.json (#1500)#814
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Langgraph feature request: langchain-ai/langgraph#7695
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Summary
checkpointer.serde.allowed_msgpack_modulesfromlanggraph.jsonand apply it to the saver's serializerCreateTaskandInvokeProcesskeep round-tripping silentlyserdeblock, langgraph's default permissive serde is preservedsamples/checkpoint-allowlistsample and thetestcases/checkpoint-allowlistintegration test that asserts noDeserializing unregistered typewarning fires when the block is setWhy
Fixes UiPath/uipath-python#1500
users couldn't silence the
Deserializing unregistered type ...CreateTaskwarning that fires on every HITL--resumebecause uipath-langchain owns saver construction and didn't expose any hook. this PR matches the public schema documented for the langgraph CLI so users can declare their custom types alongside ours.