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[Mariaperez00]

Or maybe even just define explicit fallback values instead of defaulting to und-001, that way it's more clear what to do in a (theoretical) implementation which doesn't even have locale data for und-001.

| Operation | Default value |

|---|---|

|CalendarsOfLocale | "gregory" |

|CollationsOfLocale | ??? |

|HourCyclesOfLocale | "h23" |

|NumberingSystemsOfLocale | "latn" |

|CharacterDirectionOfLocale | "ltr" |

|WeekInfoOfLocale | { [[FirstDay]]: 1, [[Weekend]]: « 6, 7 », [[MinimalDays]]: 1 } |

collations seems to be a problem, because ICU4C returns the collations for the default locale when the input locale is unrecognised:

andre@andre-dev:~$ LANG=de opt/v8/d8 -e "print(new Intl.Locale('tlh').collations)"

emoji,eor,phonebk

andre@andre-dev:~$ LANG=fr opt/v8/d8 -e "print(new Intl.Locale('tlh').collations)"

emoji,eor

(When de is the default locale, there's an additional phonebk collation in the returned array.)

This seems a bit problematic to me.

Originally posted by @anba in #76