[Nodes] ChildrenMap._put() cannot update a key #7
Description
This seems similar to #6, but the reasons are different.
If a key is already present and _put() is used to update it with a different value, the node for the key does not get updated in the EntrySupportDefault.
This seems to be because as EntrySupportDefault._refresh_entry() gets the new node from the entry (the one stored in the Info it knows about, not the entry passed as a parameter, which in this case contains a None node), the old entry did not get updated with the new node.