old_contents: #!/usr/bin/env python3
  
  """
  To compare new version with previous:
  
      ./regenerate.sh
      meld <(git show HEAD:./config.yml | ./sort-yaml.py) <(cat config.yml | ./sort-yaml.py)
  """
  
  
  import sys
  import yaml
  
  sys.stdout.write(yaml.dump(yaml.load(sys.stdin, Loader=yaml.FullLoader), sort_keys=True))
  
new_contents: #!/usr/bin/env python3
  
  """
  To compare new version with previous:
  
      ./regenerate.sh
      meld <(git show HEAD:./config.yml | ./sort-yaml.py) <(cat config.yml | ./sort-yaml.py)
  """
  
  
  import sys
  import yaml
  
  sys.stdout.write(yaml.dump(yaml.safe_load(sys.stdin, Loader=yaml.FullLoader), sort_keys=True))
  
subject: Use yaml.safe_load (#1278)