code: public function isActive($name, Context $context)
      {
          if ($this->forceRequest === false && !array_key_exists($name, $this->variables)) {
              return false;
          }
  
          if ($this->forceRequest === true && !array_key_exists($name, $this->variables)) {
              return filter_var(getenv($name), FILTER_VALIDATE_BOOLEAN);
          }
  
          return filter_var(getenv($this->variables[$name]), FILTER_VALIDATE_BOOLEAN);
      }
docs: {@inheritdoc}