By krzysztof domański on
Change record status: 
Published (View all published change records)
Project: 
Drupal core
Introduced in branch: 
10.2.x
Introduced in version: 
10.2.0
Issue links: 
https://www.drupal.org/node/2972573
Description: 

Before:
Drupal\Component\Utility\Random::machineName() generated random strings from letters and numbers.

After:
Drupal\Component\Utility\Random::machineName() generates random strings of lowercase letters, numbers and underscore.

If the machineName was used to generate an element that does not allow underscore, do not use this method. In such cases, underscore may cause random test failures.

Impacts: 
Module developers