checkpoint==2.0.22

langgraph-checkpoint 2.0.22

Summary of Changes

• Added a dedicated blob storage system to InMemorySaver for more efficient channel value management (#3960)
• Bumped checkpoint format version from 1 to 2 to support new storage format (#3954)
• Replaced msgpack with faster ormsgpack library for improved serialization performance (#3953)
• Added custom serialization hooks for better translation between MessagePack extended types and JSON (#4002)

Detailed Changes

langgraph.checkpoint.memory.InMemorySaver

• Added a new blobs storage system that efficiently stores channel values separately, reducing memory usage (#3960)
• Added _load_blobs method to retrieve channel values from blob storage (#3960)
• Updated get_tuple, list, and put methods to work with the new blob storage mechanism (#3960)

langgraph.checkpoint.base

• Added LATEST_VERSION = 2 constant to track checkpoint format version (#3954)
• Updated empty_checkpoint() and create_checkpoint() functions to use the new version (#3954)

langgraph.checkpoint.serde.jsonplus.JsonPlusSerializer

• Added customizable __init__ method that accepts an optional custom unpacking hook (#4002)
• Replaced msgpack with ormsgpack for better performance and more features (#3953)
• Added support for bytearray serialization (#3953)
• Improved error handling for better UTF-8 validation (#3953)
• Added _msgpack_ext_hook_to_json function to better translate MessagePack extended types to JSON-compatible formats (#4002)
• Added optimized serialization options to leverage ormsgpack capabilities (#3953)