a.getIntersections(b) returns an array of CurveLocations in order with respect to path 'a'

Ah, cool! But what if my path is intersected by several other paths? I end up with several arrays, all sorted individually. Once they're merged, the sorting no longer applies :(

Merging the arrays won't change the properties of each CurveLocation. As long as you test for intersections with respect to the same path, you can sort by the length property:
mergedArray.sort(function(a, b){ return a.length-b.length})

Sweeeeet! Thanks so much! I hadn't found the length property in the reference, nor was it showing up when printing the array itself. How come you know of this?