Make number formatting in Intl able to work with Int64 or other types.

pkg/intl/test/number_closure_test.dart

 // 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.
 
 /**
  * Tests based on the closure number formatting tests.
  */
 library number_closure_test;
 
 import "package:intl/intl.dart";
 import "package:unittest/unittest.dart";
@@ skipping 22 matching lines @@
   return str1.length == str2.length &&
          str1.substring(0, 8) == str2.substring(0, 8);
 }
 
 testVeryBigNumber() {
   var str;
   var fmt;
 
   fmt = new NumberFormat.decimalPattern();
   str = fmt.format(1.3456E20);
-  expect(veryBigNumberCompare('134,559,999,999,999,000,000', str), isTrue);
+  expect(veryBigNumberCompare('134,560,000,000,000,000,000', str), isTrue);
 
   fmt = new NumberFormat.percentPattern();
   str = fmt.format(1.3456E20);
   expect(veryBigNumberCompare('13,456,000,000,000,000,000,000%', str), isTrue);
 
   // TODO(alanknight): Note that this disagrees with what ICU would print
   // for this. We need significant digit support to do this properly.
   fmt = new NumberFormat.scientificPattern();
   str = fmt.format(1.3456E20);
   expect('1E20', str);
@@ skipping 325 matching lines @@
 
 testLocaleSwitch() {
   Intl.withLocale("fr", verifyFrenchLocale);
 }
 
 void verifyFrenchLocale() {
   var fmt = new NumberFormat('#,###');
   var str = fmt.format(1234567890);
   expect('1\u00a0234\u00a0567\u00a0890', str);
 }