The array package offers several ".Unsafe" modules exporting unsafe operations. Unfortunately, there are some operations that are very important for high-performance code that are only exported from the Haddock-hidden and officially unsupported (but practically fairly stable) Data.Array.Base. Among them are: IArray methods: unsafeArray unsafeAt unsafeReplace unsafeAccum unsafeAccumArray MArray methods: unsafeRead unsafeWrite unsafeNewArray I propose that we export IArray (..) and MArray (..) from new modules Data.Array.IArray.Unsafe and Data.Array.MArray.Unsafe, respectively. David