anchor.diff:    ///
     /// Returns a [Stream] of [BucketEntry]. Each element of the stream
     /// represents either an object or a directory component.
  -  Stream<BucketEntry > list({String? prefix, String? delimiter});
  +  Stream<BucketEntry> list({String? prefix, String? delimiter});
   
     /// Start paging through objects in the bucket.
     ///
  
positive.code: /// The access controls are described by [AclEntry] objects.
  class Acl {
    final List<AclEntry> _entries;
    int? _cachedHashCode; // todo: late final
  
    /// The entries in the ACL.
    List<AclEntry> get entries => UnmodifiableListView<AclEntry>(_entries);
  
negative.code:   /// List names of all buckets.
    ///
    /// Returns a [Stream] of bucket names.
    Stream<String> listBucketNames();
  
    /// Start paging through names of all buckets.
    ///
  