FilePermission not case insensitive enough under Windows

Given a policy file:

grant {
    permission java.io.FilePermission "goober", "read,write,delete";
}

then an attempt to do:

new File("GooBer").mkdir();

under Windows, when the directory does not yet exist, will result in a security exception, because FilePermission uses getCanonicalPath, which does not canonicalize case for nonexistent files and directories.