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fix(channels): correct _strip_extras dead branch for Required/NotRequired

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The second `if hasattr(t, "__origin__")` block was unreachable — the first
branch always returned, so Required[T] / NotRequired[T] resolved to the bare
class instead of the inner type. Check Required/NotRequired before the generic
__origin__ fallback.

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Sydney Runkle
2026-04-30 14:49:05 -04:00
co-authored by Claude Sonnet 4.6
parent 78938ec037
commit b59daa1f7c
1 changed files with 2 additions and 3 deletions
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libs/langgraph/langgraph/channels/binop.py
+2 -3
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@@ -22,10 +22,9 @@ __all__ = ("BinaryOperatorAggregate",)
def _strip_extras(t): # type: ignore[no-untyped-def]
"""Strips Annotated, Required and NotRequired from a given type."""
if hasattr(t, "__origin__"):
if t.__origin__ in (Required, NotRequired):
return _strip_extras(t.__args__[0])
return _strip_extras(t.__origin__)
if hasattr(t, "__origin__") and t.__origin__ in (Required, NotRequired):
return _strip_extras(t.__args__[0])
return t