Before this we should handle the case of `org.modeshape.jcr.Binary`, which is the ModeShape-specific type. Doing so would allow people to do this:

    org.modeshape.jcr.Binary[] binaries = prop.getAs( org.modeshape.jcr.Binary[].class );

The resulting array can then be used and no casting to the ModeShape-specific type would be required (e.g., to get the SHA-1).