[Webkit-unassigned] [Bug 177053] New: German Capital ẞ support

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=177053

            Bug ID: 177053
           Summary: German Capital ẞ support
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: wowmotty at gmail.com

The capital ẞ (U+1E9E ẞ LATIN CAPITAL LETTER SHARP S) was adopted into German orthography in June 2017 (ref: https://en.wikipedia.org/wiki/Capital_%E1%BA%9E).

I am no expert in the German language, but the current behavior in Chrome Canary (v63.0.3218.0) does not appear consistent - http://jsbin.com/jilenulubu/1/edit?js,console

ß ('U+00DF') → ß ('U+00DF'; toLowerCase)
ß ('U+00DF') → SS ('U+0053U+0053'; toUpperCase)
ẞ ('U+1E9E') → ß ('U+00DF'; toLowerCase)
ẞ ('U+1E9E') → ẞ ('U+1E9E'; toUpperCase)

I'm not sure what the expected behavior should be, but I would expect the capital ẞ (U+1E9E) to decompose to "SS", or change the behavior of the small ß (U+00DF) to now return a capital ẞ (U+1E9E) upon conversion to upper case.

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