.

wcfs/internal/zdata/δftail.go

@@ -470,7 +470,8 @@ func (δFtail *ΔFtail) Update(δZ *zodb.EventCommit) (_ ΔF, err error) {
 			}
 
 			δftail.root = δE.newRoot
-			// NOTE no need to clone vδE: we are writer, vδE is not returned to outside
+			// NOTE no need to clone vδE: we are writer, vδE is never returned to
+			// outside, append does not invalidate previous vδE retrievals.
 			δftail.vδE  = append(δftail.vδE, δE)
 		}
 	}
@@ -657,7 +658,7 @@ func (δftail *_ΔFileTail) _forgetPast(revCut zodb.Tid) {
 //	- AddBlk(zblk, blk),
 //	- DelBlk(zblk, blk)
 type _ZinblkOverlay struct {
-	Base map[zodb.Oid]setI64 // taken from _RootTrack.Zinblk or _ΔFileEpoch.oldZinblk
+	Base map[zodb.Oid]setI64 // taken from _RootTrack.ztrackInBlk or _ΔFileEpoch.oldZinblk
 	Adj  map[zodb.Oid]setI64 // adjustment over base; blk<0 represents whiteout
 }