boolean-contains not always true for results of intersect using same parent zone

Consider the following case:

const coverage = [[[-75.77768325805664, 42.46399280017058], [-69.57040786743164, 40.697299008636755], [-77.08505630493164, 40.772221877329024], [-75.77768325805664, 42.46399280017058]]];
const allowedCoordinates = [[[-74.3994140625, 43.14107810634587], [-70.46630859375, 40.47202439692057], [-76.387939453125, 39.2492708462234], [-76.871337890625, 42.73087427928485], [-74.3994140625, 43.14107810634587]]];
const allowedCoverage = Polygon(allowedCoordinates);
const intendedCoverage = Polygon(coverage);
const resultingShape = Intersect(allowedCoverage, intendedCoverage);

const isContained = BooleanContains(allowedCoverage, resultingShape);// -> false

In my test case above I expected the resultingShape will be contained.

[gtzinos]

Any update ?

[ggayowsky]

Confirmed that my test case fails because of lack of precision in the onBoundary calculation with inRing() in booleanPointInPolygon. In particular because of this check:

pt[1] * (xi - xj) + yi * (xj - pt[0]) + yj * (pt[0] - xi) === 0

Don’t really have an idea of how to solve that at this point. If you have some thoughts I would be happy to take a stab at a PR