I don't know. Now you end up in a circumstance where you have N files named some variant of "Foo" and the GUI layer can't distinguish them. Enforcing this inva

I don't know. Now you end up in a circumstance where you have N files named some variant of "Foo" and the GUI layer can't distinguish them. Enforcing this invariant at the filesystem layer (with well defined semantics, which HFS+ at least documents semi-well) seems eminently reasonable to me.