https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-lcid/70feba9f-294e-491e-b6eb-56532684c37f See the table following this text: "Alternate sorts can be selected by using one of the identifiers from the following table."
const valid_alternate_sorts = [_]Parsed
const valid_alternate_sorts = [_]Parsed{
// Note: x-IV-mathan is omitted due to how lookups are implemented.
// This table is used to make e.g. `de-de_phoneb` get looked up
// as `de-de` (the suffix is omitted for the lookup), but x-iv-mathan
// instead needs to be looked up with the suffix included because
// `x-iv` is not a tag with an assigned ID.
.{ .language_code = "de", .country_code = "de", .suffix = "phoneb" },
.{ .language_code = "hu", .country_code = "hu", .suffix = "tchncl" },
.{ .language_code = "ka", .country_code = "ge", .suffix = "modern" },
.{ .language_code = "zh", .country_code = "cn", .suffix = "stroke" },
.{ .language_code = "zh", .country_code = "sg", .suffix = "stroke" },
.{ .language_code = "zh", .country_code = "mo", .suffix = "stroke" },
.{ .language_code = "zh", .country_code = "tw", .suffix = "pronun" },
.{ .language_code = "zh", .country_code = "tw", .suffix = "radstr" },
.{ .language_code = "ja", .country_code = "jp", .suffix = "radstr" },
.{ .language_code = "zh", .country_code = "hk", .suffix = "radstr" },
.{ .language_code = "zh", .country_code = "mo", .suffix = "radstr" },
.{ .language_code = "zh", .country_code = "cn", .suffix = "phoneb" },
.{ .language_code = "zh", .country_code = "sg", .suffix = "phoneb" },
}