JsInterop JSON.parse()ed object differs from JSNI JSON.parse()ed object

Parsing the following JSON input and sending the resulting object to the console yields the expected results for a JSNI JSON.parse() but yields incorrect timestamps using a JsInterop JSON.parse() (with correct results for all other properties).  I'm completely at a loss as to why.  Any suggestions?

Input:

{"Contract":"STK:USD:PBA@NYSE","action":"onHistoricalData","bar":"D","bars":[{"close":21.76,"high":21.84,"low":21.38,"open":21.41,"time":1451520000,"volume":3067},{"close":21.56,"high":21.63,"low":21.14,"open":21.37,"time":1451865600,"volume":2565},{"close":21.49,"high":21.57,"low":21.26,"open":21.5,"time":1451952000,"volume":2303}],"callback":4,"metadata":{"noData":false},"t":1482867635,"t0":1451763575,"ticker":"STK:USD:PBA@NYSE"}

JSNI JSON parser:

native static Object parse( String json ) /*-{ return $wnd.JSON.parse( json ); }-*/;

JsInterop JSON parser:

@JsType( isNative = true, namespace = GLOBAL, name = "JSON" )
abstract public class JSON {
   native static public <T> T parse( String json );
}

@JsType( isNative = true, namespace = JsPackage.GLOBAL, name = "Object" )
public class Message {
   public int callback; // HARD-CODED in conjunction with Service::CALLBACK
}

// json from WebSocket

Window.console.info( parse( json ) );

Message message = JSON.parse( json );

Window.console.debug( message );

console.info:

1. Object
1. Contract:"STK:USD:PBA@NYSE"
2. action:"onHistoricalData"
3. bar:"D"
4. bars:Array[3]
1. 0:Object
1. close:21.76
2. high:21.84
3. low:21.38
4. open:21.41
5. time:1451520000
6. volume:3067
7. __proto__:Object
2. 1:Object
1. close:21.56
2. high:21.63
3. low:21.14
4. open:21.37
5. time:1451865600
6. volume:2565
7. __proto__:Object
3. 2:Object
1. close:21.49
2. high:21.57
3. low:21.26
4. open:21.5
5. time:1451952000
6. volume:2303
7. __proto__:Object
4. length:3
5. __proto__:Array[0]
5. callback:4
6. metadata:Object
1. noData:false
2. __proto__:Object
7. t:1482867635
8. t0:1451763575
9. ticker:"STK:USD:PBA@NYSE"
10. __proto__:Object

console.debug:

1. 1. Object
   1. Contract:"STK:USD:PBA@NYSE"
   2. action:"onHistoricalData"
   3. bar:"D"
   4. bars:Array[3]
   1. 0:Object
   1. close:21.76
   2. high:21.84
   3. low:21.38
   4. open:21.41
   5. time:1607400000
   6. volume:3067
   7. __proto__:Object
   2. 1:Object
   1. close:21.56
   2. high:21.63
   3. low:21.14
   4. open:21.37
   5. time:1607400000
      
   6. volume:2565
   7. __proto__:Object
   3. 2:Object
   1. close:21.49
   2. high:21.57
   3. low:21.26
   4. open:21.5
   5. time:1607400000
      
   6. volume:2303
   7. __proto__:Object
   4. length:3
   5. __proto__:Array[0]
   5. callback:4
   6. metadata:Object
   1. noData:false
   2. __proto__:Object
   7. t:1482867635
   8. t0:1451763575
   9. ticker:"STK:USD:PBA@NYSE"
   10. __proto__:Object

I tested the code in Chrome, Edge, and Safari and each yielded the same results.  Any suggestion as to where things are going awry will be greatly appreciated.

Dave

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