Missing documentation for BCP 47 support

Description

I heard that ICU supports BCP 47 language tags. I actually see it work in many places - I pass them into APIs that are documented to take old-style locale strings or just language codes, and get properly localized behavior. But I can't prove to my code reviewer that this is actually supposed to work, because I can't find anything about BCP 47 language tags in the documentation, other than the functions uloc_forLanguageTag and uloc_toLanguageTag.

Some places I looked:

There should be some clear documentation stating where I can use BCP 47 language tags instead of old-style locale strings or language codes, and any gotchas to watch out for.

Assignee

googler@icu-project.org

Reporter

icu@lindenbergsoftware.com

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