Dayjs subtract does not support week based dayjs durations => expected?

[yassuge]

Describe the bug
Dayjs subtract does not support week based dayjs durations => expected?

x=dayjs()
x.toISOString()

'2024-02-16T12:14:02.958Z'

x.subtract(1,'weeks').toISOString()

'2024-02-09T12:14:02.958Z' // expected
x.subtract(dayjs.duration('P2W')).toISOString()
'2024-02-16T12:14:02.958Z' // !!! NO IMPACT => IS THIS NOT SUPPORTED?
x.subtract(dayjs.duration('P3M')).toISOString()
'2023-11-16T12:14:02.958Z' // expected

Information

• Day.js Version dayjs@npm:1.11.10
• OS: [e.g. iOS]
• Browser [e.g. chrome 62]
• Time zone: [e.g. GMT-07:00 DST (Pacific Daylight Time)]