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JS Datatype of HTML input type="number"

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I write an HTML code that takes input from the user which type="number". I also keep the user input value into a js variable. But when I check the data type of that variable it shows string...WHY?

        <input type="number" id="mynumber" value="2"><br>
        <p id="demo"></p><br>
        <button type="button" onclick="foo()">click here</button>
           function foo ()
                var c = document.getElementById("mynumber").value;
                document.getElementById("demo").innerHTML = typeof c ;


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