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failIO has useful information in its demand signature (specifically that it bottoms) which is hidden if it is SOURCE imported, as noted in #16588. Rejigger things such that we don't SOURCE import it. Metric Increase: T13701
51067194
failIO has useful information in its demand signature (specifically that it bottoms) which is hidden if it is SOURCE imported, as noted in #16588. Rejigger things such that we don't SOURCE import it. Metric Increase: T13701