anchor.diff:  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 'package:typed_data/typed_data.dart';
   
   import 'constants.dart';
   import 'entry.dart';
  
positive.code:   /// decimal. As such, this library treats values as being encoded in decimal.
    Future<List<SparseEntry>> _readGNUSparseMap1x0() async {
      var newLineCount = 0;
      final block = Uint8Buffer();
  
      /// Ensures that [block] h as at least [n] tokens.
      Future<void> feedTokens(int n) async {
  
negative.code:     String nextToken() {
        newLineCount--;
        final nextNewLineIndex = block.indexOf($lf);
        final result = block.sublist(0, nextNewLineIndex);
        block.removeRange(0, nextNewLineIndex + 1);
        return result.readString(0, nextNewLineIndex);
      }
  