Faster JSNumber:toInt.

tests/corelib/toInt_test.dart

+// Copyright (c) 2013, 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.
+
+import "package:expect/expect.dart";
+
+main() {
+  Expect.equals(-0x80000001, (-0x80000001).toInt()); 
+  Expect.equals(-0x80000000, (-0x80000000 - 0.7).toInt()); 
+  Expect.equals(-0x80000000, (-0x80000000 - 0.3).toInt()); 
+  Expect.equals(-0x7FFFFFFF, (-0x80000000 + 0.3).toInt()); 
+  Expect.equals(-0x7FFFFFFF, (-0x80000000 + 0.7).toInt()); 
+  Expect.equals(-0x7FFFFFFF, (-0x7FFFFFFF).toInt()); 
+  Expect.equals(0x7FFFFFFE, (0x7FFFFFFE).toInt()); 
+  Expect.equals(0x7FFFFFFE, (0x7FFFFFFF - 0.7).toInt()); 
+  Expect.equals(0x7FFFFFFE, (0x7FFFFFFF - 0.3).toInt()); 
+  Expect.equals(0x7FFFFFFF, (0x7FFFFFFF + 0.3).toInt()); 
+  Expect.equals(0x7FFFFFFF, (0x7FFFFFFF + 0.7).toInt()); 
+  Expect.equals(0x80000000, 0x80000000.toInt()); 
+}