Code review comment for lp://staging/~jml/lazr.restfulclient/multiple-instance-safe

I'm very grateful for you addressing this bug.

This is very likely to fail on Windows due to the file being unable to be overwritten if it's in use. I know people have at least tried to use lazr.restfulclient and lplib on Windows. I don't know if it's actually supported or working. If it does work a bit, you might want to try not to regress it.