Differences in deferred $.when...done() handling one or many results

I would expect this code to give the same answer twice - but it doesn't. Why?

    $.when( $.getJSON("test.json") )
    .done(function(p){
        console.log(p);
    });
    $.when( $.getJSON("test.json"),$.getJSON("test.json") )
    .done(function(p,q){
        console.log(p);
    });

I get
99
[99, "success", Object]