Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    function checkTypeof(a,b) {
        return typeof a == 'string' ? a == b.toString() : a == b;
    }
    function checkTostring(a,b) {
        return a.toString() == b.toString();
    }
  };
</script>

Test runner

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checkTostring('12', 12);
checkTostring(12, 12);
 

checkTypeof('12', 12);
checkTypeof(12, 12);
 

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