.

go/todo.dot

+digraph {
+	Cgo -> SCgo_t;
+	Sgo -> SCgo_t;
+
+	SCgo_t -> Mgo;
+	SCgo_t -> Sgo;
+	SCgo_t -> Cgo;
+
+	Sgo -> Mmap_go;
+	Sgo -> io_cancel;
+	Sgo -> load_serial_next;
+
+	Cgo -> Cgo_tasks;
+
+	Cpy_r_Sgo -> Sgo;
+	Cpy_r_Sgo -> Protog_fix;
+	Cpy_r_Sgo -> Cpy_patch;
+	Cpy_r_Sgo -> Mpy_vs_Sgo;
+
+	Cgo_r_Sgo -> Cgo;
+	Cgo_r_Sgo -> Sgo;		
+
+	Cgo		[label=<C<sub>go</sub>>];
+	Sgo		[label=<S<sub>go</sub>> style=filled fillcolor=lightyellow];
+	Mgo		[label=<M<sub>go</sub>> style=filled fillcolor=lightyellow];
+	SCgo_t		[label=<S<sub>go</sub>  / C<sub>go</sub>  tests>];
+	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>>];
+	Cpy_patch	[label=<py patch: ConnID py=go>];	// 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"];
+	Mpy_vs_Sgo	[label=<M<sub>py</sub> vs S<sub>go</sub>: try/fix>];
+
+	io_cancel		[label="? conn IO vs ctx cancel"];
+	load_serial_next	[label=<? GetObject return += serial<sub>next</sub>>];
+
+	Cgo_tasks	[label="- talkMaster\n- update nodeTab/partTab\n- dial S on demand\n..."];
+}