.

wcfs/internal/zdata/δftail.go

@@ -510,6 +510,11 @@ func (δFtail *ΔFtail) SliceByFileRev(zfile *ZBigFile, lo, hi zodb.Tid) /*reado
 			} else {
 				ZinblkAt = lo
 			}
+
+			// XXX hack - should be in ΔBtail.SliceByRevRoot
+			if ZinblkAt <= lo {
+				it = -1 // don't go down beyond that
+			}
 		}
 	}