.

wcfs/δbtail.go

@@ -381,9 +381,14 @@ func diffB(ctx context.Context, a, b *Bucket) (δ map[Key]Value, err error) {
 	}
 	defer b.PDeactivate()
 
+	//fmt.Println("> diffB", a.POid())
+	//defer fmt.Println("< diffB")
+
 	av := a.Entryv() // key↑
 	bv := b.Entryv() // key↑
 	δ   = map[Key]Value{}
+	//fmt.Println("av:", av)
+	//fmt.Println("bv:", bv)
 
 	for len(av) > 0 || len(bv) > 0 {
 		ka, va := KeyMax, VDEL
@@ -414,10 +419,12 @@ func diffB(ctx context.Context, a, b *Bucket) (δ map[Key]Value, err error) {
 			δ[kb] = vb
 
 		// ka == kb   // va->vb
-		case va != vb:
+		default:
 			av = av[1:]
 			bv = bv[1:]
-			δ[ka] = vb
+			if va != vb {
+				δ[ka] = vb
+			}
 		}
 	}