@bobbrow You wrote this code 11 months ago -- was there a reason you didn't resolve the "${default}" before the other variables? I don't think we need to handle "${default}" being the result of an environment variable resolution, right?

I think I might have done it so that I was only ever working with paths that don't have ; in them. If we want to prioritize resolving ${default} over ${env:}, I think that's fine.