in miredot/lib/lunr/js/lunr.js [648:660]
lunr.Vector.prototype.magnitude = function () {
if (this._magnitude) return this._magnitude
var sumOfSquares = 0,
elementsLength = this.elements.length
for (var i = 1; i < elementsLength; i += 2) {
var val = this.elements[i]
sumOfSquares += val * val
}
return this._magnitude = Math.sqrt(sumOfSquares)
}