adds fast hints to +need and +shas
?.(=(u.a u.b) ~>(%mean.[%leaf "mate"] !!) a)
::
++ need :: demand
+ ~/ %need
|* a/(unit)
?~ a ~>(%mean.[%leaf "need"] !!)
u.a
(shaf %sham (jam yux))
::
++ shas :: salted hash
+ ~/ %shas
|= {sal/@ ruz/@}
(shax (mix sal (shax ruz)))
::
