PhantomJS array.sort different with chrome

[c-zhuo]

1. Which version of PhantomJS are you using? Tip: run phantomjs --version.
   2.1.1

2. What steps will reproduce the problem?
   JSON.stringify(
   [
   {a: 1,b: 1},
   {a: 2,b: 1},
   {a: 3,b: 1}
   ].sort(
   function (i,j) {
   return i.b > j.b ? 1 : -1;
   }
   )
   )

in PhantomJS 2.1.1
"[{"a":3,"b":1},{"a":2,"b":1},{"a":1,"b":1}]"

in Chrome
"[{"a":1,"b":1},{"a":2,"b":1},{"a":3,"b":1}]"

3. Which operating system are you using?
   Mac OS X 10.10.5

4. Did you use binary PhantomJS or did you compile it from source?
   binary

5. Please provide any additional information below.
   if change the compare function to
   if (i.b===j.b) return 0; return i.b > j.b ? 1 : -1
   the result is the same.
   so, maybe this is not a REAL problem?

[stale]

Due to our very limited maintenance capacity, we need to prioritize our development focus on other tasks. Therefore, this issue will be automatically closed (see #15395 for more details). In the future, if we see the need to attend to this issue again, then it will be reopened. Thank you for your contribution!