Pkg3 plan and status

ok, this is getting confusing now. we said:

but then you say

So: what’s the difference between “which JSON”, a “specific version of JSON” and the “specific package called JSON”? I am asking because every now and then it’s very useful to be able to Pkg.pin(JSON,version) in case of a bug somewhere. Would I have to go and find a previous uuid of JSON to be able to do that with Pkg3? If I should just RTFM please tell me, I haven’t read anything except this thread. thanks!