- Since the types of `Relationship`s are tied to the `Graph` object they belong to, fixing `pickle` support for graph types means that `Relationship`s with the same name will have a different type after `deepcopy`ing or pickling and unpickling them or their graph.
For more details, see https://github.com/neo4j/neo4j-python-driver/pull/1133
- Drop undocumented support for Bolt protocol versions 4.1.