"num" column type not working

[maxko87]

I have a number stored as a string in my collection. It's sorting the following way:

5
4
35
34
3
...

I'd like to sort them as numbers. Here's what I've tried -- none of the commented approaches fix this.

{
title: "Quantity"
data: "quantity"
# type: "num"
# sType: "numeric"
# mData: (obj, type) -> return parseInt(obj.quantity)
# mRender: (val, type, obj) -> return parseInt(val)
}

Any ideas what would work?