[Webkit-unassigned] [Bug 250903] New: toLocaleLowerCase and toLocaleUpperCase do not throw on empty string

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=250903

            Bug ID: 250903
           Summary: toLocaleLowerCase and toLocaleUpperCase do not throw
                    on empty string
           Product: WebKit
           Version: Safari 16
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: flackr at chromium.org

Created attachment 464579

  --> https://bugs.webkit.org/attachment.cgi?id=464579&action=review

Demonstrates the error thrown with a string passed and none without.

I believe by spec toLocaleLowerCase / toLocaleUpperCase are required to throw a RangeError if you specify an invalid locale per section 9.2.1 CanicalizeLocaleList with the exception thrown in step 7.c.v (https://tc39.es/ecma402/#sec-canonicalizelocalelist)

Firefox throws a RangeError for both of the following:
''.toLocaleLowerCase('');
''.toLocaleUpperCase('');

Chrome throws a RangeError for ''.toLocaleUpperCase('') and before M109 did for ''.toLocaleLowerCase(''), the lack of error for lowercase is tracked as https://crbug.com/1409058

Safari does not throw an error if the string being converted is empty, but does if you have a non-empty string being converted.

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