.

wcfs/internal/xbtree/δbtail.go

@@ -264,10 +264,14 @@ func (δΒtail *ΔTail) Get(root *Tree, key Key, at zodb.Tid) (value Value, ok b
 	// XXX key not tracked		-> panic
 	// XXX at not ∈ (tail, head]	-> panic
 
+	// XXX dirty -> rebuild
+
 	// XXX stub -> that only ZBlk.rev is used
 
 	// XXX -> index lastXXXOf(key) | linear scan ↓ looking for change <= at
 	δTtail := δΒtail.byRoot[root]
+	// XXX nil -> ?
+
 	for i := len(δTtail.vδT)-1; i >= 0; i-- {
 		δT := δTtail.vδT[i]
 		if at < δT.Rev {