Got incorrect sort when the content of cell is the numeric value of the float type. #818

I insert one cell to store the numeric value of the float type in summary section as following shown.
cells.insert(11, '<th class="sortable" data-column-type="speedup">speedup</th>')

And the speedup is the numeric value of the float type.

In genericSort fuction, convert the value of cell into lowcase, I think should check whether the value is a numeric type.
If yes, should return parseFloat(a[key]) - parseFloat(b[key])

sorted = list.sort((a, b) => { if (!isNaN(parseFloat(a[key])) && !isNaN(parseFloat(a[key]))){ return parseFloat(a[key]) - parseFloat(b[key]) } return a[key] === b[key] ? 0 : a[key] > b[key] ? 1 : -1 })