[Nodes] `ChildrenMap._put_all()` cannot update a key

[AxelVoitier]

If a key is already present and _put_all() is used to update it with a different value (regardless if we are doing it for one key or several keys at a time), the node for the key does not get updated in the EntrySupportDefault.

This is because EntrySupportDefault._set_entries() and __update_order() operate at the entry/info level, and not at the node level.

For it to work, I guess something should be calling EntrySupportDefault._refresh_entry() with the modified keys.
Welp, no. #7 shows that does not work neither. Not without updating the node in the _MapEntry first.