fix: private property not encoding

[pjebs]

class Rectangle {

  #color

  constructor(height, width, color) {
    this.height = height;
    this.width = width;
    this.#color = color;
  }

  area() {
    return this.height * this.width;
  }

  color2() {
    return this.#color;
  }
}


let r = new Rectangle(45,477, 'blue');

let ir = instanceToPlain(r);
console.log(ir)

let users = plainToInstance(Rectangle, ir); 
console.log(users.color2()); <----------------------- undefined