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

pkg/intl/test/fixnum_test.dart

+// Copyright (c) 2014, 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 intl_test;
+
+import 'package:intl/intl.dart';
+import 'package:unittest/unittest.dart';
+import 'package:fixnum/fixnum.dart';
+
+var int64Values = {
+  new Int64(12345) :
+    ["USD12,345.00", "1,234,500%"],
+  new Int64(0x7FFFFFFFFFFFF) :
+    ["USD2,251,799,813,685,247.00", "225,179,981,368,524,700%"],
+  Int64.parseHex('7FFFFFFFFFFFFFF') :
+    ["USD576,460,752,303,423,487.00", "57,646,075,230,342,348,700%"],
+  Int64.parseHex('8000000000000000') :
+    ["-USD9,223,372,036,854,775,808.00", "-922,337,203,685,477,580,800%"]
+};
+
+var int32Values = {
+  new Int32(12345) : ["USD12,345.00", "1,234,500%"],
+  new Int32(0x7FFFF) : ["USD524,287.00", "52,428,700%"],
+  Int32.parseHex('7FFFFFF') : ["USD134,217,727.00", "13,421,772,700%"],
+  Int32.parseHex('80000000') : ["-USD2,147,483,648.00", "-214,748,364,800%"]
+};
+
+main() {
+  test('int64', () {
+    int64Values.forEach((number, expected) {
+      var currency = new NumberFormat.currencyPattern().format(number);
+      expect(currency, expected.first);
+      var percent = new NumberFormat.percentPattern().format(number);
+      expect(percent, expected[1]);
+    });
+  });
+
+  test('int32', () {
+    int32Values.forEach((number, expected) {
+      var currency = new NumberFormat.currencyPattern().format(number);
+      expect(currency, expected.first);
+      var percent = new NumberFormat.percentPattern().format(number);
+      expect(percent, expected[1]);
+    });
+  });
+}