booleanIntersects returns false for LineStrings that share a point

[mschilde]

I'm using turf version 6.5.0.

booleanIntersects returns false for the following 2 LineStrings although they share a point:

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "LineString",
        "coordinates": [
          [
            13.3930069,
            52.5275117
          ],
          [
            13.3928956,
            52.5274816
          ]
        ]
      }
    },
    {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "LineString",
        "coordinates": [
          [
            13.392838775,
            52.527573275
          ],
          [
            13.3928956,
            52.5274816
          ]
        ]
      }
    }
  ]
}

Gist: http://geojson.io/#id=gist:mschilde/fc89dc38b2fd81d1e80add4fa93f34c9&map=22/52.52753/13.39292

Other touching LineStrings that also share a point are treated as intersecting and booleanIntersects returns true, e.g.

[
   {
      "type":"Feature",
      "properties":{ },
      "geometry":{
         "type":"LineString",
         "coordinates":[
            [
               13.3930069,
               52.5275117
            ],
            [
               13.3928956,
               52.5274816
            ]
         ]
      }
   },
   {
      "type":"Feature",
      "properties":{},
      "geometry":{
         "type":"LineString",
         "coordinates":[
            [
               13.3927809,
               52.5274499
            ],
            [
               13.3928956,
               52.5274816
            ]
         ]
      }
   }
]

[rowanwins]

I suspect this is a floating point math error coming from https://github.com/Turfjs/turf/blob/fcdaa939c905e6cfa80cca11a0e7cbb851ad1a47/packages/turf-boolean-disjoint/index.ts#L150-L174

This could possibly be rewritten with the robust-predicates library