bookmarks: explicitly convert to 'node' during initialization We know the content of the file is supposed to be full hex. So we can do the translation ourselves and directly check if the node is known. As nice side effect we now have proper error handling for invalid node value. Before: ! wall 0.021580 comb 0.020000 user 0.020000 sys 0.000000 (best of 134) After: ! wall 0.009342 comb 0.010000 user 0.010000 sys 0.000000 (best of 302)