anchor.diff:      String nextToken() {
         newLineCount--;
         final nextNewLineIndex = block.indexOf($lf);
  -      final result = block.sublist(0, nextNewLineIndex).asUint8List();
  +      final result = block.sublist(0, nextNewLineIndex);
         block.removeRange(0, nextNewLineIndex + 1);
         return result.readString(0, nextNewLineIndex);
       }
  
positive.code: import 'package:charcode/charcode.dart';
  import 'package:chunked_stream/chunked_stream.dart';
  import 'package:meta/meta.dart';
  import 'package:typed_data/typed_buffers.dart';
  
  import 'constants.dart';
  import 'entry.dart';
  
negative.code:   /// decimal. As such, this library treats values as being encoded in decimal.
    Future<List<SparseEntry>> _readGNUSparseMap1x0() async {
      var newLineCount = 0;
      final block = Uint8Queue();
  
      /// Ensures that [block] h as at least [n] tokens.
      Future<void> feedTokens(int n) async {
  