clone = (line) => {
  const out = create()
  out[0] = line[0]
  out[1] = line[1]
  out[2] = line[2]
  return out
}
Create a clone of the given line.

@param {line2} line - line to clone
@returns {line2} a new unbounded line
@alias module:modeling/maths/line2.clone