2) Use comma as the separator - this is already legal syntax too, but IMO it reads more naturally. (And IIRC there are already contexts where brackets are necessary to indicate a tuple.)
This would be my preferred option.
Another possibility would to be allow cases to share the same suite by stacking them:
case 401: case 402: case 403: ...
Or perhaps both. The stacking option could be useful if the cases are complicated.