.

go/zodb/storage/demo/demo.go

@@ -90,6 +90,7 @@ func (ovl *Storage) Load(ctx context.Context, xid zodb.Xid) (_ *mem.Buf, _ zodb.
 	}
 
 	useBase := false
+	inδ := false
 	var eNoData   *zodb.NoDataError
 	var eNoObject *zodb.NoObjectError
 	switch {
@@ -98,8 +99,9 @@ func (ovl *Storage) Load(ctx context.Context, xid zodb.Xid) (_ *mem.Buf, _ zodb.
 			// object deleted in δ -> whiteout
 			return data, serial, eNoData
 		} else {
-			// object not created in δ
+			// object present in δ but not yet created as of xid.at
 			useBase = true
+			inδ = true
 		}
 
 	case errors.As(err, &eNoObject):
@@ -121,7 +123,12 @@ func (ovl *Storage) Load(ctx context.Context, xid zodb.Xid) (_ *mem.Buf, _ zodb.
 	case errors.As(err, &eNoData):
 		err = eNoData
 	case errors.As(err, &eNoObject):
-		err = eNoObject
+		if !inδ {
+			err = eNoObject
+		} else {
+			// object is present in δ
+			err = &zodb.NoDataError{Oid: xid.Oid, DeletedAt: 0}
+		}
 	}
 
 	return data, serial, err

go/zodb/storage/demo/demo_test.go

@@ -102,7 +102,7 @@ func withDemoData(t *testing.T, f func(t *testing.T, ddat *DemoData), optv ...tO
 
 	// verify on all combinations of preload being split into base+δ 
 	work := xtempdir(t)
-	//defer os.RemoveAll(work)
+	defer os.RemoveAll(work)
 	test1 := func(δstart zodb.Tid, zdumpBase, zdumpδ string) {
 		t.Helper()
 		t.Run(fmt.Sprintf("δstart=%s", δstart), func(t *testing.T) {