Bad z/Z ASCII value.

lib/src/comparators.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dart.pkg.collection.comparators;
 
 // Character constants.
 const int _zero         = 0x30;
 const int _upperCaseA   = 0x41;
-const int _upperCaseZ   = 0x5b;
+const int _upperCaseZ   = 0x5a;
 const int _lowerCaseA   = 0x61;
-const int _lowerCaseZ   = 0x7b;
+const int _lowerCaseZ   = 0x7a;
 const int _asciiCaseBit = 0x20;
 
 /// Checks if strings [a] and [b] differ only on the case of ASCII letters.
 ///
 /// Strings are equal if they have the same length, and the characters at
 /// each index are the same, or they are ASCII letters where one is upper-case
 /// and the other is the lower-case version of the same letter.
 ///
 /// The comparison does not ignore the case of non-ASCII letters, so
 /// an upper-case ae-ligature (Æ) is different from
@@ skipping 367 matching lines @@
 /// If there is no non-zero digits before, then leading zeros at [index]
 /// are also ignored when comparing numerically. If there is a non-zero digit
 /// before, then zeros at [index] are significant.
 bool _isNonZeroNumberSuffix(String string, int index) {
   while (--index >= 0) {
     int char = string.codeUnitAt(index);
     if (char != _zero) return _isDigit(char);
   }
   return false;
 }