NetworkX JSON Graph Serialization: Preserving Custom Attribute Types

Goal: Ensure that after loading a graph backup stored in JSON format, all node and edge attributes retain their original Python types (e.g., tuples, nested dictionaries, custom objects) without manual post‑processing.

Constraint: NetworkX’s built‑in JSON functions (json_graph.node_link_data and node_link_graph) only serialize values that are native JSON types; any non‑scalar attribute is converted to a string or omitted, leading to silent type loss during round‑trip.

Uncertainty: There is no official mechanism to embed type information or to plug in a custom encoder/decoder that works transparently with the existing readwrite API, leaving users to decide whether to pre‑process attributes, extend the JSON functions, or rely on external validation.

• What is the recommended way to embed type metadata into JSON node/edge attributes so that networkx.readwrite.json_graph can restore the original Python types?
• How can a custom JSON encoder/decoder be integrated with NetworkX’s json_graph functions without modifying the library source?
• Are there any community‑maintained extensions or utilities that provide schema‑aware JSON serialization for NetworkX graphs?