Is it true that jQuery 1.6.2 automatically evals on the json response?

I thought result will be a json object if the response header includes application/json,

$.get(...,function(result){
    //here result is a json object
});

But today I tried a earlier version of jQuery,found result is a string.

So is it true that jQuery 1.6 automatically converts the result to object(eval("("+result+")")) for me开发者_运维知识库?

UPDATE

Here's the related header,but it turns out I have to eval it manually:

X-Content-Type-Options  nosniff
Content-Type    application/json; charset=EUC-JP

UPDATE

No doubt now,it's confirmed.

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If the server sets the Content-Type: application/json response header, jQuery automatically evals the result, and this is true even for older versions.

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Yes, this feature doesn't exist in jquery 1.3.2