what is the difference between or impact of this Assignment Attribute in the

Experiment Settings

modal vs "Assign value based on attribute" in the

Edit Override Rule

modal when setting up the experiment rule on the feature itself? Do we need to set both? What happens if you do or don't make any changes on

Experiment Settings

value (i've seen by default it's null)

The source of truth should be the feature itself and I believe this setting should not do anything at the moment besides serve as metadata.