/-  metadata=metadata-store, res=resource
|%
+$  cache-action
  $%  [%graph-to-mark (pair resource:res (unit mark))]
  ==
--
::
|_  act=cache-action
++  grad  %noun
++  grow
  |%
  ++  noun  act
  --
++  grab
  |%
  ++  noun  cache-action
  --
--