object(A)[47]
  private 'id' => string '4d4ad6ec48177eaa0a000001' (length=24)
  private 'b' =>
    object(Proxy\BProxy)[53]
      private 'documentPersister' =>
        object(Doctrine\ODM\MongoDB\Persisters\DocumentPersister)[58]
          private 'pb' =>
            object(Doctrine\ODM\MongoDB\Persisters\PersistenceBuilder)[71]
              ...
          private 'dm' =>
            object(Doctrine\ODM\MongoDB\DocumentManager)[14]
              ...
          private 'evm' =>
            object(Doctrine\Common\EventManager)[15]
              ...
          private 'uow' =>
            object(Doctrine\ODM\MongoDB\UnitOfWork)[18]
              ...
          private 'hydrator' => null
          private 'class' =>
            object(Doctrine\ODM\MongoDB\Mapping\ClassMetadata)[66]
              ...
          private 'collection' =>
            object(Doctrine\MongoDB\Collection)[54]
              ...
          private 'queuedInserts' =>
            array
              ...
          private 'documentsToUpdate' =>
            array
              ...
          private 'fieldsToUpdate' =>
            array
              ...
          private 'cmd' => string '$' (length=1)
          public 'hydratorFactory' =>
            object(Doctrine\ODM\MongoDB\Hydrator\HydratorFactory)[17]
              ...
      private 'identifier' => string '4d41e62f48177ec609000002' (length=24)
      public '__isInitialized__' => boolean false
      protected 'id' => null