JsonPlusSerializer: msgpack encode of dataclass-heavy values spends most of its time in `isinstance(obj, SendProtocol)` on Python 3.11
Public issue #9410 in langchain-ai/langgraph. The source issue contains the full report and discussion.
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Reported problem
The record contains the title “JsonPlusSerializer: msgpack encode of dataclass-heavy values spends most of its time in `isinstance(obj, SendProtocol)` on Python 3.11” but no substantive source summary.
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Demand hypothesis
Treat the reported task or obstacle as an interview lead. A feature request, complaint or search for alternatives does not by itself identify a budget owner or willingness to pay.
Commercial evidence gaps
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Validation decision
Group original reports by the same task and deduplicate authors and reposts. Ask how the task is handled today and what it costs; test a defined offer before claiming paid demand.