Proposal: Add System.FilePath to base

[Benjamin Franksen]

Benjamin Franksen wrote:
> What, then, is the result of (addExtension "/" "x")? What, in general, is
> the behavior in case the first argument ends with a path separator?

Another example where the semantics is unclear (to me) is

> takeBaseName :: FilePath -> String  Source
>  Get the base name, without an extension or path. 
>  takeBaseName "file/test.txt" == "test"
>  takeBaseName "dave.ext" == "dave"

What is (takeBaseName "dir.ext/")? "dir"? Or ""? A general principle that
would clarify this could be "An extension of a file path is always a suffix
of the file path. It never contains a path (directory) separator."

Ben