fix(checkpoint): avoid silent None when msgpack type import fails#6972

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Miguel Miranda Dias (pandego) wants to merge 1 commit intolangchain-ai:mainfrom

pandego:fix/6970-msgpack-missing-module-fallback

Miguel Miranda Dias (pandego) commented Feb 28, 2026 •

edited

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Summary

preserve serialized payload values when msgpack reconstruction fails due to missing importable classes
keep existing allowlist/blocking behavior unchanged
add a regression test for the missing-module restore path

Validation

in libs/checkpoint: uv run ruff format .
in libs/checkpoint: uv run ruff check --fix .
in libs/checkpoint: uv run ruff check .
in libs/checkpoint: uv run ruff format . --check
in libs/checkpoint: uv run ruff check --select I .
in libs/checkpoint: uv run mypy . --cache-dir .mypy_cache
in libs/checkpoint: uv run pytest

Fixes #6970


          fix(checkpoint): preserve msgpack payload when class import fails

1aea919

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