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TypedDict(extra_items=ReadOnly[int]) currently accepts extra values of any type because the ReadOnly wrapper is passed directly to the internal checker. Named fields already unwrap this qualifier, but extra fields do not.
Unwrap ReadOnly before checking extra values. Add a regression that accepts an integer and rejects a string, including the extra key in the error path.
Validation on Python 3.12: the regression fails before the fix. The full suite passes afterward (536 passed, 9 skipped, 9 expected failures), and Ruff 0.15.20 lint/format checks pass for the changed files. Mypy reports an existing missing typeshed.stdlib.types import in _decorators.py; the same error was confirmed in a clean worktree at the original commit.