in src/Transport.php [501:510]
private function getOSVersion(): string
{
if (!isset($this->OSVersion)) {
$disable_functions = (string) ini_get('disable_functions');
$this->OSVersion = strpos(strtolower($disable_functions), 'php_uname') !== false
? ''
: php_uname("r");
}
return $this->OSVersion;
}