Hello all, I recently noticed that there is a subset of packages on Hackage which have had a non-monotonic release in their history. Non-monotonic releases occur for various reasons; for example, http://hackage.haskell.org/package/QuickCheck-1.2.0.1 was made in 2010 (2.1 was released in 2008), ostensibly as a minor bugfix release. However, I found at least one case where a non-monotonic release was due to package clobbering: http://hackage.haskell.org/package/Adaptive-0.1 http://hackage.haskell.org/package/Adaptive-0.22 It's easy to see that these are two different packages. 0.1 is the "later" release, but it is completely shadowed by the old 0.22 release. I'm not sure if I have any concrete recommendations (since this problem is mostly subsumed by the "people shouldn't be able to upload arbitrary stuff to Hackage problem); but I thought this might be interesting information to someone. Edward