code: public function set(string $name, $value) : self
      {
          if (self::$init == false) {
              $this->init();
          }
  
          if (array_key_exists($name, $this->data) && $this->data[$name] === $value) {
              return $this;
          }
  
          $this->changed = true;
  
          $this->data[$name] = $value;
  
          return $this;
      }
docs: @param string $name
  @param $value
  
  @return $this|self