[Haskell-cafe] Is bumping the version number evil, if it's not mandated by the PVP?

Ivan Lazar Miljenovic ivan.miljenovic at gmail.com
Sun Aug 15 06:32:27 EDT 2010

Sebastian Fischer <sebf at informatik.uni-kiel.de> writes:

> Hello,
> On Aug 14, 2010, at 12:43 PM, Ross Paterson wrote:
>>> When bumping only a.b.c.D, the new version is not installed as a
>>> dependency if the old version already is installed (unless the new
>>> version is explicitly demanded.) It seems bumping a.b.c.D has
>>> advantages for some users and disadvantages for others.
>> How would bumping the major version change that?
> Right, it doesn't. My worry with bumping only the patch level is that
> people who explicitly want to depend on the efficient version of my
> library need to depend on a.b.c.D and cannot follow the good practice
> of depending on a.b.*.

Well, then you have ">= a.b.c.d && < a.(b+1)".  This is necessary for
whenever a bug-fix affecting your program was made in a dependency.

> I actually like the idea of making a patch-level release *and* a new
> major release to get the best of both approaches. Do you think this is
> reasonable?

It could work, as that way users packages that use your library whose
maintainers haven't updated the deps yet to use the new major version
can still get the benefits of the improved speed.

If you were to take this route, I would strongly advise stating in the
Description that the new major version is API-compatible with the old
one (with the major bump being for "advertising" reasons).

> To make things clear, I will shortly release a new version of the
> primes package for efficient generation of prime numbers. The new
> version asymptotically improves memory usage. The point of the library
> is to generate primes efficiently, so a major version bump feels
> justified. However, as explained above, I plan to additionally make a
> patch-level release.

Well, Brent Yorgey seems to the be the only person who uses primes in a
Hackage package [1], so maybe you can just do a major bump release and
co-ordinate with him to bump his np-extras package?


Ivan Lazar Miljenovic
Ivan.Miljenovic at gmail.com

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