x/text/language: Wrong language is selected

[iandees]

What version of Go are you using (go version)?

$ go version
go version go1.17 darwin/amd64

Does this issue reproduce with the latest release?

Yes (via play.golang.org)

What operating system and processor architecture are you using (go env)?

go env Output

$ go env
GOARCH="amd64"
GOHOSTARCH="amd64"
GOHOSTOS="darwin"

What did you do?

I have a set of strings in Norwegian and Danish. The user requests content via Accept-Language header of nb-no (Norwegian). Example:

https://play.golang.org/p/rfr4sjGVHkk

What did you expect to see?

I expected to get an exact match to the Norwegian language tag.

What did you see instead?

Match() picks Danish instead.

[thanm]

@mpvl

[benthomson]

I second that this is causing similar issues for us. I suspect it is defaulting to Danish because Norwegian Bøkmal / Norse Bøkmal originates from Danish and there may be some logic behind the scenes to make this determination (I haven't delved into the source code to confirm this theory). Regardless adding support for this would be much appreciated as we currently having to handle locales that begin with nb as a special case and have a load of legacy issues to resolve where we have persisted references to Danish that should be Norwegian. Many thanks!