Fix integer's % operation; fix parsing of doubles; update co19 tests.

runtime/lib/integers.dart

 // Copyright (c) 2011, 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 {
   num operator +(num other) {
     return other.addFromInteger(this);
   }
   num operator -(num other) {
     return other.subFromInteger(this);
   }
   num operator *(num other) {
     return other.mulFromInteger(this);
   }
   num operator ~/(num other) {
     if (other == 0) {
       throw const IntegerDivisionByZeroException();
     }
     return other.truncDivFromInteger(this);
   }
   num operator /(num other) {
     return this.toDouble() / other.toDouble();
   }
   num operator %(num other) {
-    if (other == 0) {
+    if ((other is int) && (other == 0)) {
       throw const IntegerDivisionByZeroException();
     }
     return other.moduloFromInteger(this);
   }
   int operator negate() {
     return 0 - this;
   }
   int operator &(int other) {
     return other.bitAndFromInteger(this);
   }
@@ skipping 73 matching lines @@
   int truncate() { return this; }
 
   int toInt() { return this; }
   double toDouble() { return new Double.fromInteger(this); }
 
   int pow(int exponent) {
     throw "IntegerImplementation.pow not implemented";
   }
 
   String toStringAsFixed(int fractionDigits) {
+    // Issue 460.
     throw "IntegerImplementation.toStringAsFixed not implemented";
   }
   String toStringAsExponential(int fractionDigits) {
+    // Issue 460.
     throw "IntegerImplementation.toStringAsExponential not implemented";
   }
   String toStringAsPrecision(int precision) {
+    // Issue 460.
     throw "IntegerImplementation.toStringAsPrecision not implemented";
   }
   String toRadixString(int radix) {
     final table = const ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
                          "A", "B", "C", "D", "E", "F"];
     if ((radix <= 1) || (radix > 16)) {
       throw "Bad radix: $radix";
     }
     final bool isNegative = this < 0;
     var value = isNegative ? -this : this;
@@ skipping 45 matching lines @@
     if (other < 0) {
       return -1;
     } else {
       return 0;
     }
   }
   int shlFromInt(int other) {
     throw const OutOfMemoryException();
   }
 }