Duration format result for SSS
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Description
**Describe the bug (see #1521 all issues aren't close !)**
When use duration format for an ISO8601, result it's not as expected :
myDuration = dayjs.duration('PT3M39.096S')
myDuration.format("SSS") => "undefined"
**Expected behavior**
myDuration.format("SSS") => "096"
**Information**
- Day.js Version [1.10.7]
- OS: [Windows]
- Browser [all]
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