Rule request

raise SystemExit(arg) and sys.exit(arg) are identical in behavior, one should be favored over the other for consistency.

Reasoning

I don't know which of the two would be preferable for this linter (I suspect sys.exit(arg), but raise SystemExit(arg) doesn't require any imports), but several other contexts where multiple forms are valid have a rule enforcing one form as the standard (such as single vs double quotes, or string formatting methods), and I figure the same logic should apply here.