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A sane replacement for Data.Version from the base package.
Hydrogen.Version is also exported by Hydrogen.Prelude where
it comes with a few more instances (e.g. for Data.Serialize).
Differences to Data.Version
Sane Ord instance
Data.Version relies on Ord for lists,
which will consider 1.0 to be less than 1.0.0. Hydrogen.Version
considers these to be equal.
Sane Read and Show instances
With Hydrogen.Version you can
just do read "1.0.0" :: Version, whereas the Read and Show
instances for Data.Version do not give a concise representation:
show hydrogenVersion == "1.0.0"
show dataVersion == "Version versionBranch = [1,0,0], versionTags = []"
Stricter API
In Hydrogen.Version you can create a Version
only via mkVersion, whereas in Data.Version the constructor is
exported, thus you could so such nonsense as
Data.Version.Version [] [] (which is not a proper version at all).
No Tags
Hydrogen.Version does not support tags. This is
intentional, since there is no agreed upon definition for Ord in
the presence of tags (consider alpha vs beta vs snapshot vs
ga vs ...).
