Currently, 2htdp/universe adds a small inset to the drawn image. For example,

(require 2htdp/universe
         2htdp/image)

(big-bang (square 100 'solid 'purple)
  [on-draw values])

looks like this:

The inset is defined here and used here. I want to add the ability to turn off this inset (or to remove it as an option, but presumably whoever added it has a different aesthetic opinion).

Would it be best to add it as a big-bang clause? That doesn't seem ideal as it's not really a significant decision. Maybe a different display-mode option ('borderless)?

I'm happy to make the change but I know htdp has special design considerations so I'm asking how to proceed.