fs.FileSystem incompatible with vfs.FileSystem

[gbbr]

I've been trying to use fs.FileSystem with a current implementation that we have wrapped over vfs.FileSystem from the golang tools library but it has deemed unsuccessful due to the extra Join method in your package.

I was wondering if you know any scenarios where Join might behave differently from path.Join ? If not, would it be fair to remove this as a path joiner seems to not necessarily be part of a FileSystem interface. I might be wrong though. Thoughts?

[gbbr]

We sorted this out using a custom wrapper https://github.com/sourcegraph/rwvfs/blob/master/vfs.go#L127