Datatable Cooked Storage Method?

I’m making a lot of use of UDataTables, however, I was wondering if there is any information about how they are stored on disk when the game is cooked someone can direct me to.

Are they serialised as the raw datatype, or do they remain in a text file format? I ask because I wonder if it makes sense to economise on data by using uint8s instead of having a explicit enum format that uses more characters and various things like that. That does mean interpretation functions at runtime though so I am curious about which method is best.