[Haskell-cafe] Package Versioning Policy

Christoph Breitkopf chbreitkopf at googlemail.com
Thu Jan 5 18:05:03 CET 2012

Forgot the header, sorry.

On Thu, Jan 5, 2012 at 5:54 PM, Christoph Breitkopf <
chbreitkopf at googlemail.com> wrote:

> Hello,
> I'm trying to figure out how to handle versioning of my IntervalMap
> package. I've just read the package versioning policy:
> http://www.haskell.org/haskellwiki/Package_versioning_policy
> I don't quite understand all the recommendations in the above document,
> though:
> a) You are not allowed to remove or change the types of existing stuff. Ok.
> b) You are allowed to add new functions. But that can break compilation
> because of name conflicts. Seems to be allowed on the grounds that this is
> easy to fix in the client code.
> c) You are not allowed to add new instances. I don't get this - how is
> this any worse than b)?
> I do understand that it is not generally possible to prevent breaking code
> - for example if the client code depends on buggy behavior that gets fixed
> in a minor version update. That seems unavoidable - after all, bugfixes are
> _the_ reason for minor updates.
> Regards,
> Chris
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