Know at least two people, both HNers, that danced with this in the past year with no guidance on how to handle it. One asked me up front, and I prevented him f

Know at least two people, both HNers, that danced with this in the past year with no guidance on how to handle it. One asked me up front, and I prevented him from making the mistake. The other thought he knew what he was doing and reported the wrong figure. Instantly got flagged, and he amended the return with haste.