Log message:
Import hs-convertible-1.0.1 as wip/hs-convertible.

convertible 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.

Convertible is also used by HDBC 2.0 for handling marshalling of data
to and from databases.

Convertible is backed by an extensive test suite and passes tests on
GHC and Hugs.