[xmonad] adding an existing workspace with DynamicWorkspaces?

Hi all, Today, while helping crhalpin in #xmonad, I discovered that if you call X.A.DynamicWorkspaces.addWorkspace with the name of an already-existing workspace, it simply makes another one, which seems... odd. Does anyone actually rely on this behavior? Or is it OK if I fix it so that calling addWorkspace with the name of a workspace that already exists is a no-op? -Brent