为什么在我的情况下symfony dumpFile（）忽略Umask值？

Question

来自Drupal:scafold文件生成器的摘录如下。

public function generateAutoload() {
    $vendorPath = $this->getVendorPath();
    $webroot = $this->getWebRoot();
    // Calculate the relative path from the webroot (location of the
    // project autoload.php) to the vendor directory.
    $fs = new SymfonyFilesystem();
    $relativeVendorPath = $fs->makePathRelative($vendorPath, realpath($webroot));
    $fs->dumpFile($webroot . "/autoload.php", $this->autoLoadContents($relativeVendorPath));
  }

为什么此$fs->dumpFile()在创建autoload.php文件时不遵守umask值。这是同一期https://github.com/drupal-composer/drupal-scaffold/issues/98

的副本