Script in UI locale resolves incorrectly

[fungc-io]

• When ui_locale is zh-Hant, it is treated as zh-Hant-HK in the translation and zh-Hans-CN in the templates
• When ui_locale is zh-Hans, it is also treated as zh-Hant-HK in the translation and zh-Hans-CN in the templates

[louischan-oursky]

https://go.dev/play/p/q_haFShsPgG

[tung2744]

Interestingly, I got a different result: https://goplay.tools/snippet/VQH4Qs4MXY4

What could be the difference?

[tung2744]

Oh, it is the order of supported tag. If we remove zh-TW from supported tags (Which has Exact as confidence), and put zh-CN before zh-HK, zh-CN will be selected instead of zh-HK.

[louischan-oursky]

The doc of Match says when there is no match, it returns the first item in the supported tags.

[tung2744]

If you put en-US as the first item, it won't be matched. The problem is the library didn't consider the confidence level if it is not Exact. (zh-CN is Low when matched with zh-Hant, and zh-HK is High, but still zh-CN were selected)

[louischan-oursky]

Maybe related? https://github.com/golang/text/blob/master/language/match.go#L106