To make things a little stranger, it's worth mentioning that I'm not sure if bepuphysics v2 works well with Unity right now. Attempts in the last several months by users trying to upgrade from v1 to v2 had... less than ideal results under that runtime.

The library is .NET Standard 2.0 compliant, though, so in theory it should work. It may require some extra work on the runtime side of things. As time goes on, I'd hope that mono/CoreRT or whatever the AOT story ends up being/CoreCLR converge and Unity can embrace them for all their target platforms. (Burst is also an option, but that would require a massive rework in bepuphysics that I can't really afford to do given that my projects aren't on Unity.)