Constant fold strict comparison based on incoming types: different (exact) types means that the res…

runtime/lib/integers.dart

 // Copyright (c) 2012, 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.
 
 // TODO(srdjan): fix limitations.
 // - shift amount must be a Smi.
 class _IntegerImplementation {
   factory _IntegerImplementation._uninstantiable() {
     throw new UnsupportedError(
         "_IntegerImplementation can only be allocated by the VM");
@@ skipping 271 matching lines @@
 
     _OneByteString string = _OneByteString._allocate(index);
     for (int i = 0, j = index; i < index; i++) {
       string._setAt(i, reversed[--j]);
     }
     return string;
   }
 }
 
 // Reusable buffer used by smi.toString.
-List _toStringBuffer = new Uint8List(20);
+final List _toStringBuffer = new Uint8List(20);
 
 // Represents integers that cannot be represented by Smi but fit into 64bits.
 class _Mint extends _IntegerImplementation implements int {
   factory _Mint._uninstantiable() {
     throw new UnsupportedError(
         "_Mint can only be allocated by the VM");
   }
   int get _identityHashCode {
     return this;
   }
@@ skipping 31 matching lines @@
     } else {
       return 0;
     }
   }
   int _shlFromInt(int other) native "Bigint_shlFromInt";
 
   int pow(int exponent) {
     throw "Bigint.pow not implemented";
   }
 }