Fix narrowing down types in deferred nodes #4490
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Previously a partial type could be narrowed down to a bogus `Optional[Any]` type. Selectively switch narrowing down off in deferred nodes to work around the issue. Fixes #4488.
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Previously a partial type could be narrowed down to a bogus
Optional[Any]type. Selectively switch narrowing down offin deferred nodes to work around the issue.
Fixes #4488.