Recently I started developing a Haskell library and I have a question about 
package dependencies. 
Right now when I need my project to depend on some other package I only specify 
the package name 
in cabal file and don't bother with providing the package version. This works 
because I am the 
only user of my library but I am aware that if the library were to be released 
on Hackage I would 
have to supply version numbers in the dependencies. The question is how to 
determine proper 
version numbers?

I can be conservative and assume that version of libraries in my system are the 
minimum required 
ones. This is of course not a good solution, because my library might work with 
earlier versions 
but I don't know a way to check that. What is the best way to determine a 
minimal version of a 
package required by my library?

I also don't see any sane way of determining maximum allowed versions for the 
dependencies, but 
looking at other packages I see that this is mostly ignored and package 
maintainers only supply 
lower versions. Is this correct approach?

Janek

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