[Haskell-cafe] poor perfomance of indexU in uvector package

[Don Stewart]

alexey.skladnoy:
> Hello
> 
> This post meant to be literate haskell.
> 
> I found that perfomace of indexU is very poor and it is not fast O(1)
> operation which is very surprising. Here is some benchmarcking I've
> done. Everything compiled with -O2
> 

You're using the streamed version when its not fusing. Use the
non-streaming direct implementation exported from Data.Array.Vector.UArr

This is really an API bug, but I've not had time to sanitize the use.