ExtendScript Oddity with File/Folder on Mac OS X

Here's a really odd one, happens on Mac OS X Lion 10.7.3 with InDesign CS5.5.

Enter the following little InDesign Script in ExtendScript Toolkit, and run it targeting InDesign CS5.5:

// Create a path of the form /Users/kris/Desktop or something similar, then resolve the path back to a File object

var fn = File(File("~").fsName + "/Desktop");

alert(fn.fsName + " exists: " + fn.exists);

If all is well, you get a dialog saying something like "/Users/kris/Desktop exists: true".

Nothing weird yet. Leave ExtendScript Toolkit running for a sec.

Now start up a Terminal window, and go to the /Volumes folder. Create a subfolder called Users (so  that the folder /Volumes/Users exists on your computer).

Re-run the script.

Weirdness: I get "/Volumes/Users/kris/Desktop exists: false". Euh?

Anyone seen that before? Don't forget to remove "/Volumes/Users" again!

It is probably related to another weirdness. Run this one-liner:

alert(File("///").fsName);

You'll get "/Volumes" - but you'd expect to get "/", no?