[Haskell-cafe] Why does Haskell PVP have two values for the major version? "A.B..." and a couple other questions

David Thomas davidleothomas at gmail.com
Tue Dec 16 01:46:18 UTC 2014

To my mind, bump A if it's a big change that's going to require a lot
of work tracking it; B if it's a small change that can probably be
upgraded to fairly simply.

On Mon, Dec 15, 2014 at 5:42 PM, Zach Moazeni <zach.moazeni at gmail.com> wrote:
> Hello,
> Forgive me if this is a frequently asked question, I've searched the web and
> can't find an answer. I originally sent this to the Beginners list and
> someone said this might get more responses here instead.
> What is the history that led up to the PVP specifying two values as the
> major version?
> I come from other tools that primarily use http://semver.org/ (or a variant)
> and I'm confused in what cases I should bump "A" but not "B" (or bump "B"
> but not "A")?
> A concrete example: If I make backwards incompatible changes to a package
> whose latest version is 1.0.x, should the next version be 2.0.x or 1.1.x?
> What sorts of things should I consider for choosing 2.0 over 1.1 and vice
> versa?
> Another question, by far most packages I have encountered either lead with a
> 0 or a 1 for "A". Does that have some bearing on the long term stability
> that package users should expect in the future?
> Finally, if "1.0.x.." is meant to convey a level of long term support, does
> "B" get rarely used? Since "C" version bumps to include backwards compatible
> additions, and "D"+ for backwards compatible bug fixes. (I know "D" isn't
> technically a PVP category, I'm just relating it to the patch version of
> semver).
> Thanks for your help!
> -Zach
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