ToStringAsFixed returns now 0 instead of -0.

runtime/vm/double_conversion.cc

 // 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.
 
 #include "vm/double_conversion.h"
 
 #include "third_party/double-conversion/src/double-conversion.h"
 
 #include "vm/exceptions.h"
 #include "vm/globals.h"
@@ skipping 37 matching lines @@
   return false;
 }
 
 bool DoubleToStringAsFixed(double d, int fraction_digits, String& result) {
   static const int kMinFractionDigits = 0;
   static const int kMaxFractionDigits = 20;
   static const int kMaxDigitsBeforePoint = 20;
   // The boundaries are exclusive.
   static const double kLowerBoundary = -1e21;
   static const double kUpperBoundary = 1e21;
+  // TODO(floitsch): remove the UNIQUE_ZERO flag when the test is updated.
   static const int kConversionFlags =
-      double_conversion::DoubleToStringConverter::NO_FLAGS;
+      double_conversion::DoubleToStringConverter::UNIQUE_ZERO;
   const int kBufferSize = 128;
   // The output contains the sign, at most kMaxDigitsBeforePoint digits,
   // the decimal point followed by at most fraction_digits digits plus the \0.
   ASSERT(kBufferSize >= 1 + kMaxDigitsBeforePoint + 1 + kMaxFractionDigits + 1);
 
   if (d <= kLowerBoundary || d >= kUpperBoundary) {
     return false;
   }
   if (fraction_digits < kMinFractionDigits ||
       fraction_digits > kMaxFractionDigits) {
@@ skipping 71 matching lines @@
       kDoubleToStringCommonExponentChar,
       0, 0,  // Ignored in precision mode.
       kMaxLeadingPaddingZeroes,
       kMaxTrailingPaddingZeroes);
 
   UNIMPLEMENTED();
   return false;
 }
 
 }  // namespace dart