I have noodled on this problem a bit in https://github.com/hadley/strict https://github.com/hadley/strict, which I'm contemplating bringing back to life over th

I have noodled on this problem a bit in https://github.com/hadley/strict https://github.com/hadley/strict, which I'm contemplating bringing back to life over the coming year. It's certainly very difficult to cover 100% of all possible problems, but I suspect we can get good coverage of the most common failure points (specifically around recycling and coercion) with a decent amount of work.