[Haskell-cafe] How to determine correct dependency versions for a library?

[Aleksey Khudyakov]

> The blacklisting approach has one major disadvantage that noone has
> mentioned yet:
> Adding more restrictive constraints does not work, the broken package will
> be on hackage forever, while adding a new version with relaxed constraints
> works well.
>
That illustrate real problem It's not possible to specify correct
version constraints when package is uploaded. So one have to choose
between optimistic and conservative approach. Both have disadvantages.
In ideal world one need ability to adjust version bounds after package
upload.