Internal state of object changes when running planner

[mielvds]

When calling the planner as follows:

let from = { latitude: 51.054556,
  longitude: 3.725333,
  name: 'A' };
let to = { latitude: 51.04892,
  longitude: 3.728874,
  name: 'B' };
planner.query({
    from, to
  })
    .take(3)
    .on('end', () => {
      console.log(from)
    });

the id attribute of fromand to will be changed to for example "Departure Point" which is undesireable behavior and will cause problems when using const. Better to make a copy of these ILocation objects in the planner.