ff_draftpicks is designed to return the following:
for the current-season, it should return the numeric-indexed picks (i.e. 1.01, 2.12, 3.01 etc) that have not yet been drafted (and should incorporate trades)
for future seasons, it should return future picks by round
Sleeper used to make the former available but now only makes it available if the league is actively drafting - otherwise it only makes the traded picks available and (sometimes) a draft order.
To recreate the previous functionality, I envision sleeper_draftpicks to need to do:
check status of draft and whether a draft order is available.
if draft order is not avail, treat as future picks
if draft order is avail, build pick order from draft order and draft type then apply pick trades, if any.
then run ff_draft and see if there's any selected picks to remove
Forking previous discussions from #352 and #361