Method constructor

packages/core/src/Rectangle.ts:20–25

(
    public west = 0,
    public south = 0,
    public east = 0,
    public north = 0
  )

  )

  constructor(
    public west = 0,
    public south = 0,
    public east = 0,
    public north = 0
  ) {}

  get width(): number {
    let east = this.east