RESOLVED FIXED250903
toLocaleLowerCase and toLocaleUpperCase do not throw on empty string 
https://bugs.webkit.org/show_bug.cgi?id=250903
Summary toLocaleLowerCase and toLocaleUpperCase do not throw on empty string
Robert Flack
Reported 2023-01-20 08:58:30 PST
Created attachment 464579 [details] 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.
Attachments
Demonstrates the error thrown with a string passed and none without. (515 bytes, text/html)
2023-01-20 08:58 PST, Robert Flack 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Radar WebKit Bug Importer
Comment 1 2023-01-23 12:22:28 PST
<rdar://problem/104568214>
Yusuke Suzuki
Comment 2 2023-01-23 12:24:12 PST
Pull request: https://github.com/WebKit/WebKit/pull/8986
EWS
Comment 3 2023-01-23 14:22:17 PST
Committed 259242@main (e99f5f69bf90): <https://commits.webkit.org/259242@main> Reviewed commits have been landed. Closing PR #8986 and removing active labels.
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