bthreads "resolve" does not function for Node.js the same as "path.resolve" would

[niftylettuce]

In our code, if we use bthreads, and instead of using path.resolve on the Node.js side, and instead use bthreads.resolve, then it does not match the same behavior as the Node.js internal path.resolve would. I would think this should simply just use path.resolve if it was available, instead of ALSO layering on top toPath call here https://github.com/chjj/bthreads/blob/master/lib/internal/source.js#L78.