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The "convertible" Haskell package provides a typeclass with a single
function that is designed to help convert between different types:
numeric values, dates and times, and the like.
The conversions perform bounds checking and return a pure Either value.
This means that you need not remember which specific function performs
the conversion you desire.
Also included in the package are optional instances that provide
conversion for various numeric and time types, as well as utilities for
writing your own instances.
Finally, there is a function that will raise an exception on
bounds-checking violation, or return a bare value otherwise, implemented
in terms of the safer function described above.
WWW: http://hackage.haskell.org/cgi-bin/hackage-scripts/package/convertible
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