[Webkit-unassigned] [Bug 231545] New: REGRESSION (iOS 15): Intl.DateTimeFormat returns 2 digit years when year is 'numeric' and month is '2-digit' and day is '2-digit'

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=231545

            Bug ID: 231545
           Summary: REGRESSION (iOS 15): Intl.DateTimeFormat returns 2
                    digit years when year is 'numeric' and month is
                    '2-digit' and day is '2-digit'
           Product: WebKit
           Version: Other
          Hardware: iPhone / iPad
                OS: Other
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: matt.carroll139 at gmail.com

This test case passes:

```
const dtf = new Intl.DateTimeFormat('en-AU', { timeZone: 'Australia/Melbourne', year: 'numeric' });
const date = new Date(2021, 9, 2);
const parts = dtf.formatToParts(date);
const year = parts.find(part => part.type === 'year')
shouldBe(year.value, "2021")
```


This test case will fail:

```
const dtf = new Intl.DateTimeFormat('en-AU', { timeZone: 'Australia/Melbourne', year: 'numeric', month: '2-digit', day: '2-digit' });
const date = new Date(2021, 9, 2);
const parts = dtf.formatToParts(date);
const year = parts.find(part => part.type === 'year')
shouldBe(year.value, "2021") // actual is "21"
```

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