TracerUtil

```
refineByType: function (item) {
  return $.isNumeric(item) ? this.refineNumber(item) : this.refineString(item);  
},
refineString: function (string) {
    return string === '' ? ' ' : string;
},
refineNumber: function (number) {
    return number === Infinity ? '∞' : number;
}
```

Jquery .isNumeric(Infinity) returns false, so shouldn't it be checked in refineString ?
