// Takes a map from block digest to replication level and represents
// it in a keep.ReadServers structure.
func SpecifyReplication(digestToReplication map[int]int) (rs keep.ReadServers) {
// Takes a map from block digest to replication level and represents
// it in a keep.ReadServers structure.
func SpecifyReplication(digestToReplication map[int]int) (rs keep.ReadServers) {