reverse = (geometry) => {
  const oldsides = toSides(geometry)

  const newsides = oldsides.map((side) => [side[1], side[0]])
  newsides.reverse() // is this required?
  return create(newsides)
}
Reverses the given geometry so that the sides are flipped in the opposite order.
This swaps the left (interior) and right (exterior) edges.
@param {geom2} geometry - the geometry to reverse
@returns {geom2} the new reversed geometry
@alias module:modeling/geometries/geom2.reverse

@example
let newgeometry = reverse(geometry)