Dialect support?

[srl295]

https://unicode.org/reports/tr35/tr35-general.html#Display_Name_Elements

example nl-BE = "Flemish", not just "Dutch (Belgium)"

[FrankYFTang]

@srl295 Just want to clarify, are you asking

1. the implementation to output "Flemish" for "nl-BE" instead of "Dutch (Belgium)", or
2. the specification to allow the API to allow both "Flemish" and "Dutch (Belgium)" could be output for "nl-BE" and demand a method to control which one being output?

The current draft of specification does not mandate the implementation to only output "Dutch (Belgium)", the implementation could choose to output "Flemish". It does not give the API caller to control the output. But is such control necessary? Shouldn't the implementation always try to output "Flemish"?

[srl295]

@FrankYFTang coming back to this:

is such control necessary? Shouldn't the implementation always try to output "Flemish"?

Yes, it's necessary. When choosing a language, it's common to sort the same language together:

• mac example
  

[srl295]

CLDR calls it CombineLanguage

[FrankYFTang]

Could you first clarify which one you are asking about?

1. the implementation to output "Flemish" for "nl-BE" instead of "Dutch (Belgium)", OR
2. the specification to allow the API to allow both "Flemish" and "Dutch (Belgium)" could be output for "nl-BE" and demand a method to control which one being output?

[srl295]

Could you first clarify which one you are asking about?

Yes, sorry for my terseness.

1. the implementation to output "Flemish" for "nl-BE" instead of "Dutch (Belgium)", OR

(1) is already what the implementation provides, so I was not commenting on that.

2. the specification to allow the API to allow both "Flemish" and "Dutch (Belgium)" could be output for "nl-BE" and demand a method to control which one being output?

(2) is necessary for the reason mentioned above. Language selection UIs need to be able to choose "Dutch (Belgium)".

[anba]

FWIW the SpiderMonkey implementation (currently only available through the shell-only addIntlExtras helper), defaults to UDISPCTX_STANDARD_NAMES per the recommendation voiced in https://unicode-org.atlassian.net/browse/CLDR-13430. So for nl-BE, SpiderMonkey returns "Dutch (Belgium)".

[FrankYFTang]

I put together a v2 repo on https://github.com/FrankYFTang/intl-displaynames-v2/ please move the future discussion there.

[FrankYFTang]

This proposal reach Stage 4 in 2020 Sept TC39 meeting. Move this issue to tc39/proposal-intl-displaynames-v2#13