0.3.16

langgraph 0.3.16

Summary of Changes

• Improved schema coercion with better error handling and type compatibility, increasing default max depth and adding support for set types (#3871)
• Reduced memory usage by implementing weak references in the pregel execution engine, preventing reference cycles (#3907)
• Added internal implementation of get_function_nonlocals to reduce external dependencies (#3894)

Detailed Changes

langgraph.graph.schema_utils.SchemaCoercionMapper

• Increased default max_depth from 5 to 12, allowing deeper nested schema structures
• Added support for set types in schema coercion
• Improved type compatibility by handling errors more gracefully
• Enhanced Pydantic model support for both v1 and v2 with better type hint handling
• Now returns original values instead of raising exceptions in most type coercion failures
• Made the mapper cache a module-level variable rather than a class variable
• Added proper handling of type hints for more accurate schema coercion

langgraph.pregel.Pregel

• Implemented weak references to prevent reference cycles and reduce memory leaks
• Improved memory management by using weakref.WeakMethod for runner callbacks
• Enhanced formatting of conditional assignments for better code readability

langgraph.pregel.runner.PregelRunner

• Refactored to use weak references for futures, task scheduling and execution
• Moved callback implementations from nested functions to module-level functions for better organization
• Separated sync and async call implementations into distinct functions (_call and _acall)
• Improved error handling during task execution

langgraph.pregel.utils.get_function_nonlocals

• Added internal implementation of get_function_nonlocals function
• Implemented AST analysis to determine nonlocal variables accessed by functions
• Added support for proper handling of attributes and nested function definitions