I'm not saying it'll be bug-free. My point is that it'll have exactly the same bugs on either platform. This may be preferable to having different bugs on different platforms.
That's a good point. As a (shim) library developer I think I might agree -- because it would perhaps be easier to find bugs in my library -- as an application developer I wouldn't because I would have to find different workarounds for different bugs.
Different bugs on different platforms are like an early Christmas present:
You don't even need to write tests which include your "expectations" of the result anymore.
Just call the code with randomized inputs for both platforms, and if there is a difference, you found a bug.