Hi Sergey,

> What is correct way of adding specific versions of Haskell packages?

The user's manual has a section that demonstrates how to accomplish that:


Other sections of the manual have useful information about this subject,
too, so it might be worthwhile to read the whole chapter about Haskell.

> Why do we have both, say, 'transformers' and 'transformers_0_3_1' but
> only one (latest) version of many other pacakges, including
> hackage-security?

For every package, we ship the version suggested by LTS Haskell 7.x by
default. If Hackage happens to have a newer version, too, then we add
that as well. hackage-security is not part of LTS Haskell at all, so we
have only the latest version.

Best regards

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