Douglas,

> FFI isn't cross platform either which makes for more work
> wrapping it.

What exactly do you mean this?! The FFI is perfectly cross-platform as long
as some naming conventions are kept. And that's true for pluggable
primitives as well. E.g., if you name some plugin "foo" on one platform and
"bar" on another one you shouldn't expect things to work that smoothly ;-)

Cheers,
  - Andreas