Bad z/Z ASCII value.
Changed it to test that tests fail with wrong value, changed it back
to another wrong value.
Review URL: https://codereview.chromium.org//1458853006.
diff --git a/lib/src/comparators.dart b/lib/src/comparators.dart
index 19b70e9..05615ba 100644
--- a/lib/src/comparators.dart
+++ b/lib/src/comparators.dart
@@ -7,9 +7,9 @@
// 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.
