To reproduce:

Render a Primer::Beta::BorderBox component.

Actual behavior

It is not possible to specify system arguments for the rendered list element.

Expected behavior

It should be possible to specify system arguments for the rendered list element.

Background

We have a lightweight responsive table implementation based on the Border Box component. We are currently in the process of adding ARIA roles and metadata for better A11y support. Unfortunately, we can't apply additional attributes (e.g. ul[role="rowgroup"] without resorting to hackery.