.

wcfs/δbtail.go

@@ -39,6 +39,8 @@ type Key    = int64
 type Value  = zodb.Oid // XXX assumes key points to IPersistent
                        // XXX how to represent deletion? InvalidOid?
 
+type SetKey = SetI64
+
 // ΔBtail represents tail of revisional changes to BTrees.
 //
 // It semantically consists of

wcfs/δbtail_test.go

@@ -312,7 +312,7 @@ func TestΔBTail(t *testing.T) {
 	}
 	*/
 
-	// direct tree_i -> tree_{i+1}
+	// direct tree_i -> tree_{i+1} -> _{i+2} ...   plus  reverse ... tree_i <- _{i+1} <- _{i+2}
 	at1 := tg.head
 	kv1 := XGetTree(db, at1, tg.treeRoot)
 	for _, tree := range testv {
@@ -387,7 +387,7 @@ type kvdelta1 struct {
 }
 func kvdiff(kv1, kv2 map[Key]string) []kvdelta1 {
 	delta := []kvdelta1{}
-	keys := SetI64{}
+	keys := SetKey{}
 	for k := range kv1 { keys.Add(k) }
 	for k := range kv2 { keys.Add(k) }
 	keyv := []Key{}