4.1: Add new serializer

[SkifAlef]

I'm trying to add new auth serializer:

start/hooks.js

const { ioc } = require('@adonisjs/fold');
const { hooks } = require('@adonisjs/ignitor');
const LdapSerializer = use('App/Serializers/LdapSerializer');

hooks.after.providersRegistered(() => {
  ioc.extend('Adonis/Src/Auth', 'ldap', function () {
    return new LdapSerializer;
  }, 'serializer');
});

config/auth.js

...
session: {
  serializer: 'ldap',
  model: 'App/Models/User',
  scheme: 'session',
  uid: 'email',
  password: 'password'
},

But I get RuntimeException: E_INCOMPLETE_CONFIG: Make sure to define ldap serializer on auth inside config/auth.js when I'm trying to login.

What I'm doing wrong?