anchor.diff:    // Test for file stream buffered handling of large files.
     static void testReadWriteStreamLargeFile() {
       // Create the test data - arbitrary binary data.
  -    List<int> buffer = new List<int>(100000);
  +    List<int> buffer = new List<int>.filled(100000, 0);
       for (var i = 0; i < buffer.length; ++i) {
         buffer[i] = i % 256;
       }
  
positive.code:     Expect.equals(true, !wrongExceptionCaught);
      exceptionCaught = false;
      try {
        List<int> buffer = new List<int>(10);
        openedFile.writeFromSync(buffer, -1, 1);
      } on RangeError catch (ex) {
        exceptionCaught = true;
  
negative.code:     Expect.equals(true, !wrongExceptionCaught);
      exceptionCaught = false;
      try {
        List<int> buffer = new List<int>.filled(10, 0);
        openedFile.readIntoSync(buffer, 0, -1);
      } on RangeError catch (ex) {
        exceptionCaught = true;
  