The section on what a headless FFI test can and cannot pin was written before anything CPU-side was bound, so it had no example of the one shape that beats store-and-return: scalars in and struct fields out, with nothing for a permuted layout to cancel against. It also did not say that MeasureText answers 0 without a window, which is the assumption this lane started with and had to measure its way out of. Two lanes have now guessed the same thing.
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