anchor.diff: -import 'dart:collection';
  -
   import 'entities/entity_mapping.dart';
   import 'nodes/attribute.dart';
   import 'nodes/cdata.dart';
  
positive.code:   final bool optimizeNamespaces;
  
    /// The current node stack of this builder.
    final Queue<NodeBuilder> _stack = ListQueue();
  
    /// Adds a [XmlText] node with the provided [text].
    ///
  
negative.code:       bool isSelfClosing = true,
        Object? nest}) {
      final element = NodeBuilder();
      _stack.add(element);
      namespaces.forEach(this.namespace);
      attributes.forEach(attribute);
      if (nest != null) {
  