We use canonicalizePaths where we need well-formed paths and cannot rely on the input being sane.
we now have: * AnchoredFile -- for representing a file with context * File -- for representing a file only Both representations mean "file" in the broader sense, including directories.
This is a little bit less fancy, but avoids lazy IO. It depends a little bit more on FilePath, but that also allows for a more general interface.
