public static async Task ScheduleAsync(this IActionScheduler actionScheduler, int estimateCost, Func <Task> action, CancellationToken cancellationToken, Func <int> actualCost = null, Func <Exception, int> exceptionCost = null)
=> await actionScheduler.ScheduleAsync(estimateCost, async() =>
{
await action().ConfigureAwait(false);
return(0);
}, cancellationToken, actualCost == null?default(Func <int, int>) : _ => actualCost(), exceptionCost)
.ConfigureAwait(false);
