PyYAML read list of int

[zisco]

I'm using a config.yaml and want to read a list of integers in "week":

{'worksheet_name': 'March 2024',
 'week': [12, 13],
 'name': 'John Doe',
 'username': 'jd9003'}

Reading this yaml with

with open("config.yaml", encoding='utf8') as f:
    cfg = yaml.load(f, Loader=yaml.FullLoader)

strangely leads to this value

week: [[12, 13]]

and not to

week: [12, 13]

Which format should be used for a list of int in yaml?