As the title already mentions, is there a way to check whether a variable is a real jqXHR?

I mean (imaginary):

var resource = $.get('/resource');

if (resource instanceof jqXHR)
{
    // do something
}

The actual problem I am trying to solve, is for a modal-plugin I'm working on.

$('#element').modal({
    content : function()
    {
        return $.get('/resource');
    }
});

And, the content variable can be either string or function. In case of string, it will be static, in case of function it will be run every time upon opening the modal.

But, I am looking to allow the content callback to return either jqXHR or string. With string it's pretty simple, if (typeof returned === 'string'), but what about jqXHR?

I know that I could simply check for string and in case it's not a string, assume it's jqXHR, but I want my plugin to be as strong as possible, and disallow working with unexpected types.

javascript jquery
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