.

wcfs/internal/zdata/δftail.go

@@ -291,12 +291,14 @@ func (δFtail *ΔFtail) Update(δZ *zodb.EventCommit) (_ ΔF, err error) {
 				return ΔF{}, err
 			}
 
-			// XXX
+			if δ != nil {
 				fmt.Printf("δZBigFile: %v\n", δ)
-
 				return ΔF{}, fmt.Errorf("ZBigFile<%s> changed @%s", oid, δZ.Tid)
 			}
 
+			continue
+		}
+
 		zt, ok := δFtail.trackSetZBlk[oid]
 		if !ok {
 			continue // not tracked