Providers can use this function to add proposals to the completion. They
can do so asynchronously by means of the finished argument. Providers must
ensure that they always call this function with finished set to TRUE
once each population (even if no proposals need to be added).
Providers can use this function to add proposals to the completion. They can do so asynchronously by means of the finished argument. Providers must ensure that they always call this function with finished set to TRUE once each population (even if no proposals need to be added).