CPI-U prints negative

I haven't posted in a while, because, frankly, who wants to keep hearing that the sky is falling?! But... CPI-U, the Fed's official urban price-inflation indicator, just printed out at minus 10 basis points (-0.10%).

The Fed's inflation metrics are geared to understate inflation (there has been a move to replace the current system with a simple median price change, but it hasn't gotten much traction) -- I don't know if this could lead to overstating deflation or not. Given the fact that the changes are multipliers rather than subtractions, my assumption is their measurements will understate deflation too, but I can't say that with any certainty at all.