Forcing GC to garbage collect a map key-value

[sverker]

To make sure the old map State with value is no longer live you might want to do

handle_cast(compute, State) ->
  FreshState = maps:remove(key, State),
  tail_call(FreshState).

tail_call(FreshState) ->
  erlang:garbage_collect(),
  {noreply, maps:put(key, compute(), FreshState)};