anchor.diff:  
   [source,yaml]
   authentication: {
  -  className: org.apache.tinkerpop.gremlin.server.auth.SimpleAuthenticator
  +  className: org.apache.tinkerpop.gremlin.server.auth.SimpleAuthenticator,
     config: {
       credentialsDb: conf/tinkergraph-empty.properties,
       credentialsDbLocation: data/credentials.kryo}}
  
positive.code: credentials.removeUser("daniel")
  credentials.countUsers()
  ----
  
  Serialization
  ^^^^^^^^^^^^^
  
negative.code: 
  [source,yaml]
  authentication: {
    className: org.apache.tinkerpop.gremlin.server.auth.SimpleAuthenticator,
    config: {
      credentialsDb: conf/credential-graph.properties}}
  
  