/// <summary>
 /// Drops the table if exists async.
 /// </summary>
 /// <returns>The table if exists async.</returns>
 /// <param name="This">The database connection.</param>
 /// <typeparam name="T">The mapped type.</typeparam>
 public static Task DropTableIfExistsAsync <T>(this IAsyncDatabaseConnection This) =>
 This.DropTableIfExistsAsync <T>(CancellationToken.None);