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ActiveModel Serializer converts underscores to hyphens

Here's the problem I ran into. I setup rails in the API mode and configured to use ActiveModelSerializers and follow the JSON5 spec. But turns out, that converts all the field names in my JSON responses to contain hyphens instead of underscores.

The serializer was converting the database field first_name into first-name in my JSON responses.
I don't like that! I want my field names to stay the same. Untouched and pristine, like the frozen lakes of Antartica. Turns out you can ask your serializer not not mess with your field names. Just add the following line in your active_model_serializer.rb
ActiveModel::Serializer.config.key_transform = :unaltered