Support for Adobe-Japan1/KRName IVD Collection in any language-specific deployments

[spencer246]

I expected that 'Source Han Sans' with the language tag set to ko-kr behaves exactly the same as 'Source Han Sans K', but it seems that it is not the case due to IVSs; for example, Source Han Sans K has information on IVSs that belongs to KRName IVD collection, but Source Han Sans (JP version) does not.

Therefore, <span style="font-family: Source Han Sans K;" lang="ko">卿&#xE0109;</span> renders the IVS according to the KRName IVD collection in any modern browsers, but <span style="font-family: Source Han Sans;" lang="ko">卿&#xE0109;</span> does not, although it is properly language-tagged as Korean.

Similarly, if I use 'Source Han Sans K', I cannot access glyphs corresponding to Adobe-Japan1 IVS such as 辻󠄀 <U+98F4, U+E0100> with or without the ja-jp language tagging.

I am not sure whether this behavior is an intended feature or a bug, but given that the two fonts share the same set of 65,535 glyphs, wouldn't it be better if IVSs are rendered the same across any language-specific deployments? (at least, if they are properly language-tagged...)