BCP 47: duplicate U extension keywords are rejected as invalid by ICU4C. ICU4J is fine with it
Description
Spun off from Ecma 402 bug 262 , ICU4J does allows duplicate keywords in U-extension of BCP 47 per RFC 6067 while ICU4C does not.
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public class DuplicateUnicodeKeyword {
public static void main(String[] args) {
var loc = com.ibm.icu.util.ULocale.forLanguageTag("en-u-kf-true-kf-false");
System.out.println(loc.toLanguageTag()); // Prints "en-u-kf-true"
}
}ICU4C's behavior should match ICU4J's. Note that RFC 6067 does allow duplicate keywords. The second or later one is ignored, while the first one is honored.
I can work on this.
Status
Assignee
Yoshito Umaoka
Reporter
Jungshik Shin
Labels
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None
Time Needed
None
Start date
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Fix versions
Priority
medium