public boolean hasVal(NodeCursor<A, V> node) {
return valstore.get(node.index()) != null;
}
public void setVal(NodeCursor<A, V> node, V v) {
// Also, vals cannot be primitive types. Need a 'null' to indicate invalid.
assert (v != null);
valstore.set(node.index(), v);
}
public V getVal(NodeCursor<A, V> node) {
return valstore.get(node.index());
}