Allow sting values for permitted classes for YAML::dump - #810
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In Rails console the command reload! creates new ActveRecord classes and they are not equal to the ones set in ActiveRecord.yaml_column_permitted_classes= at the initializaton time.
Therefore it is needed to list them there not as classes but as String containing the name of a class.
In the case of YAML.load this works but in the case of YAML.dump it does not.
This PR fixes the issue.