[Webkit-unassigned] [Bug 214223] New: Intl.Locale.maximize() and Intl.Locale.minimize() are not spec compliant on iOS 14 Beta 2

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=214223

            Bug ID: 214223
           Summary: Intl.Locale.maximize() and Intl.Locale.minimize() are
                    not spec compliant on iOS 14 Beta 2
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: iPhone / iPad
                OS: Other
            Status: NEW
          Severity: Blocker
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: wopian at wopian.me

Created attachment 404057

  --> https://bugs.webkit.org/attachment.cgi?id=404057&action=review

Spec compliant output of Intl.Locale implemented properties/methods

The functions implemented in the Intl.Locale class do not function as expected in the iOS 14 Beta 2 version of Safari. 

When no property is accessed it returns the locale using the toString function instead of a Locale instance (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/Locale).

When you attempt to get a property from what should be a regular Locale instance, it instead returns undefined instead of the property's expected value.

I came across this bug as I was polyfilling Intl.Locale for browsers that didn't support Intl.Locale in a feature release and it was suddenly breaking (used maximize().region) with these undefined return values for iOS users using our staging pre-release builds.

Example:
const locale = new Intl.Locale('en')
const max = locale.maximize().baseName// undefined in iOS 14 Dev 2. Correct behaviour is 'en-Latn-US'
const min = locale.minimize().baseName// undefined in iOS 14 Dev 2. Correct behaviour is 'en'

Example 2:
const locale = new Intl.Locale('ja-Jpan-JP-u-ca-japanese-hc-h23-kf-lower-co-emoji-nu-jpan')
const max = locale.maximize() 
// Returns 'ja-Jpan-JP-u-ca-japanese-hc-h23-kf-lower-co-emoji-nu-jpan' in iOS 14 Dev 2. 
// Correct behaviour is returning a Locale object

Live Demo:
https://6f6bm.csb.app/

Attached is the spec compliant output and the iOS 14 Dev 2 output. This is identical on:
- Edge 83, 
- Edge 85 (Dev), 
- Chrome 83
- Chrome 86 (Canary)
- Firefox 78
- Firefox 79 (Developer)

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