* Checks whether a hash is safe to overwrite * * Make sure that the newly saved hash won't overwrite a prior road * with a different set of classes or majors, but with the same road. * Useful for making sure a saved road's hash doesn't hide access to a road * saved earlier. * * @param string $hash a string of the road hash to check * @param string $classes a string of th
($hash, $classes, $majors)
source not stored for this graph (policy: none)