There is also, Custom element API section that is "TODO". Yes I saw those options the first time, but woulnd't you say the documentation is limited ;) if such is the case.
So far I see 2 sentences related to the subject, compare that to V2 docs.
I will try to see how svelte performs for this, but so far Vue wc-wrapper seems to be the most promising option out of "non-wc first" ecosystems.
