Load Balancing Weight

Using the load balancing from cloudflare it is possible to set desired weights for origins within a pool. According to the documentation a weight of 0 means no traffic is routed to this origin. But it is not clear if in the event of a single available origin with weight 0 (no other origins are available), the traffic will be routed to the origin with weight 0.

This is I believe an important questions because with such behaviour you could set up some backup origins in the load balancing.