/// <summary>
 /// Applies the classic emit behavior (<see cref="EmitBehaviors.Classic"/>) and processes lists and dictionaries
 /// without members.  That is, if your list or dictionary is extended with its own properties and members, they will
 /// not be serialized nor deserialized if applied in the document.
 /// </summary>
 /// <param name="this">The configuration container to configure.</param>
 /// <returns>The configured configuration container.</returns>
 public static IConfigurationContainer EnableClassicMode(this IConfigurationContainer @this)
 => @this.Emit(EmitBehaviors.Classic).Extend(ClassicExtension.Default);