Issue #3118581 by kiamlaluno: The documentation for Crypt::randomBytesBase64()...

   *   The number of random bytes to fetch and base64 encode.

   *

   * @return string

   *   The base64 encoded result will have a length of up to 4 * $count.

   *   A base-64 encoded string, with + replaced with -, / with _ and any =

   *   padding characters removed.

   */

  public static function randomBytesBase64($count = 32) {

    return str_replace(['+', '/', '='], ['-', '_', ''], base64_encode(random_bytes($count)));