.

go/todo.dot

@@ -28,6 +28,7 @@ digraph {
 	Cpy_r_Sgo	[label=<C<sub>py</sub>  read S<sub>go</sub>>];
 	Cgo_r_Sgo	[label=<C<sub>go</sub>  read S<sub>go</sub>>];
 	Cgo_r_Spy	[label=<C<sub>go</sub>  read S<sub>py</sub>>];
+	Cleanup		[label="Cleanup history"];
 	Cpy_patch	[label=<py patch: ConnID py=go> style=filled fillcolor=lightyellow];	// C<sub>py</sub>  patch for ConnID interop. with S<sub>go</sub>>];
 	Mmap_go		[label="io.ReaderAt via mmap"];
 	Protog_fix	[label="proto(go/py) compat fix"];

go/todo.svg

@@ -136,8 +136,8 @@
 </g>
 <!-- Cpy_r_Sgo&#45;&gt;Mpy_vs_Sgo -->
 <g id="edge12" class="edge"><title>Cpy_r_Sgo&#45;&gt;Mpy_vs_Sgo</title>
-<path fill="none" stroke="black" d="M629.148,-294.139C680.49,-282.239 763.151,-263.079 820.41,-249.807"/>
-<polygon fill="black" stroke="black" points="821.485,-253.151 830.437,-247.483 819.905,-246.331 821.485,-253.151"/>
+<path fill="none" stroke="black" d="M628.489,-293.872C636.745,-291.902 645.271,-289.88 653.292,-288 709.461,-274.832 773.397,-260.19 819.743,-249.638"/>
+<polygon fill="black" stroke="black" points="820.676,-253.015 829.65,-247.383 819.123,-246.189 820.676,-253.015"/>
 </g>
 <!-- Cgo_r_Sgo -->
 <g id="node12" class="node"><title>Cgo_r_Sgo</title>
@@ -175,5 +175,10 @@
 <path fill="none" stroke="black" d="M415.344,-288.055C418.157,-280.176 421.572,-270.617 424.723,-261.794"/>
 <polygon fill="black" stroke="black" points="428.055,-262.87 428.122,-252.275 421.463,-260.516 428.055,-262.87"/>
 </g>
+<!-- Cleanup -->
+<g id="node14" class="node"><title>Cleanup</title>
+<ellipse fill="none" stroke="black" cx="729.292" cy="-306" rx="66.8882" ry="18"/>
+<text text-anchor="middle" x="729.292" y="-302.3" font-family="Times,serif" font-size="14.00">Cleanup history</text>
+</g>
 </g>
 </svg>