title: REST api returned json gets sorted in increasing order automatically
body: <p>I am working on REST api build with golang when I am returning a json of employees like </p>
  
  <pre><code>{
     "data":{
        "10":{
           "1517616000":[1000]
        },
        "15":{
           "1517616000":[1200]
        },
        "29":{
           "1517616000":[1200]
        },
        "42":{
           "1517616000":[1200]
        }
     }
  }
  </code></pre>
  
  <p>it should be showing in 42,15,29,10 order as I am sorting the data with priority parameter. When I check with console it shows me correct output but not on postman and browser</p>
  
  <p>Used following function to return json </p>
  
  <pre><code>c.JSON(200, gin.H{
    "status": response,
   })
  </code></pre>