docs: public boolean remove(ExpirableReference expirable)
      {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.entry(this, tc, "remove", (expirable == null ? "null" : "ObjId=" + expirable.getID() + " ET=" + expirable.getExpiryTime()));
  
          boolean reply = tree.delete(expirable);
          if (reply)
          {
              size--;
          }
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.exit(this, tc, "remove", "reply=" + reply);
          return reply;
      }