I'd like to find out how Canvas roles/permissions affect the "roles" value sent to the LTI provider when an LTI link is opened from a Canvas course. For example, I'd like to know how it might be possible to control whether the "TA" role, or custom roles derived from it, sends "instructor" in the LTI roles parameter. Is there a default matrix of which Canvas roles map to which LTI roles ("student" or "instructor" vs. anything else)?
I am working with a publisher that makes its products available via LTI. I don't have administrative access to a full Canvas "account" instance in which I can test this myself.