* fix: Avoid accessing slug when state is None
* fix: ignore pre-rfc drafts as rfc-to-rfc references
* fix: also ignore pre-rfc to pre-rfc refs
* chore: remove breakpoint
* fix: ignore subseries non-downrefs
* fix: label nodes as RFCS when possible
* fix: get "rfc" flag right
* chore: Remove comment, answer seems to be "no"
* refactor: Specify state type; drop redundant source doc type check
We're only admitting source__type="draft", so
no need to check it again in filter queries
* refactor: Specify state type in old code
6083205cc8