code: def _delete_node_storage(self, node):
          
          if node == BLANK_NODE:
              return
          # assert isinstance(node, list)
          encoded = self._encode_node(node, put_in_db=False)
          if len(encoded) < 32:
              return
          """
          ===== FIXME ====
          in the current trie implementation two nodes can share identical subtrees
          thus we can not safely delete nodes for now
          """
          self.deletes.append(encoded)
docs: delete storage
          :param node: node in form of list, or BLANK_NODE