/// <summary>
/// Specifies an asynchronous condition limiting when the validator should not run.
/// The validator will only be executed if the result of the lambda returns false.
/// </summary>
/// <param name="rule">The current rule</param>
/// <param name="predicate">A lambda expression that specifies a condition for when the validator should not run</param>
/// <param name="applyConditionTo">Whether the condition should be applied to the current rule or all rules in the chain</param>
/// <returns></returns>
public static IRuleBuilderOptions <T, TProperty> UnlessAsync <T, TProperty>(this IRuleBuilderOptions <T, TProperty> rule, Func <T, CancellationToken, Task <bool> > predicate, ApplyConditionTo applyConditionTo = ApplyConditionTo.AllValidators)
{
predicate.Guard("A predicate must be specified when calling UnlessAsync", nameof(predicate));
return(rule.UnlessAsync((x, ctx, ct) => predicate(x, ct), applyConditionTo));
}