Hi Mark, sorry if I'm missing something but wouldn't it seem that "/baz" should return IsDir = true?

We're currently being affected by this issue and I can confirm that applying the PR in its original form works fine, whereas the current git version (dc520c9) is still showing the issue.

In our case the flow that we're seeing is the request comes in through box.go/Resolve (name: "assets/design/cart" - redirected by net/http/fs.go "/assets/design/cart/index.html"). The output is:

name: "assets\design\cart"
info: {
  Path: "assets\design\cart"
  size: 0
  isDir: true
}

There is no err being set so there is never a chance to run b.openWoExt(name) and it simply falls through to the file.NewFileR call which creates a new file (not a directory)

Hopefully I've misunderstood something in the flow. If you'd like I could throw up a simple Buffalo repository with a similar file structure to what we're using to help with debugging?

EDIT: I don't seem to be able to replicate this myself in direct tests against V2... will keep on working on our particular issue but the troubleshooting above should still be reasonable.

EDIT 2: Replicated against V2 when using a file based store. I've created some very crude tests in the below referenced repo in /v2/http_file_test.go