krisajenkins
Remove ElmType instances of non-32bit int types
As requested, here's this change with a more thorough explanation.
Elm's Int type is a 32bit two's complement integer. The exact size of
Haskell's Int type is unspecified. Having instances for integral types
which don't have an isomorphism to Elm types allows for lossy
conversions when moving data between the two languages. For example
sending an Elm Int to a Haskell function with type Int8 -> Int8 will
only work with 8 bit values and raise an error for any out of range
values. By only providing instances for Int32 the user is forced into
being more careful with how they marshall integer types between Haskell
and Elm.
See https://github.com/elm-lang/core/issues/742#issuecomment-257484290 for information on the specifics of Elm's Int type.
