Make graph conditionally codable

Author: flowtoolz

Code/Graph/Graph.swift

@@ -2,6 +2,7 @@ import SwiftyToolz
 
 extension Graph: Sendable where NodeID: Sendable, NodeValue: Sendable {}
 extension Graph: Equatable where NodeValue: Equatable {}
+extension Graph: Codable where NodeID: Codable, NodeValue: Codable {}
 
 /**
  Holds `Value`s in unique ``GraphNode``s which can be connected through ``GraphEdge``s

Code/Graph/GraphEdge.swift

@@ -3,6 +3,9 @@ import SwiftyToolz
 extension GraphEdge: Sendable where NodeID: Sendable {}
 extension GraphEdge.ID: Sendable where NodeID: Sendable {}
 
+extension GraphEdge: Codable where NodeID: Codable {}
+extension GraphEdge.ID: Codable where NodeID: Codable {}
+
 /**
  Directed connection of two ``GraphNode``s in a ``Graph``
 

Code/Graph/GraphNode.swift

@@ -2,6 +2,7 @@ import SwiftyToolz
 
 extension GraphNode: Sendable where ID: Sendable, Value: Sendable {}
 extension GraphNode: Equatable where Value: Equatable {}
+extension GraphNode: Codable where ID: Codable, Value: Codable {}
 
 /**
  Unique node of a ``Graph``, holds a value, can be connected to other nodes of the graph

README.md

@@ -221,7 +221,7 @@ SwiftNodes is already being used in production, but [Codeface](https://codeface.
 ## Roadmap
 
 1. Further align API with official Swift data structures (What would Apple do?):
-   1. Add the usual suspects of applicable protocol conformances (`Sequence`/`Collection`, `Codable`, expressibility by literals, etc.)
+   1. Add the usual suspects of applicable protocol conformances (`Sequence`/`Collection`, expressibility by literals, etc.)
    2. Compare with- and learn from API and implementation of [Swift Collections](https://github.com/apple/swift-collections)
 2. Round out and add algorithms (starting with the needs of Codeface):
    1. Make existing algorithms compatible with cyclic graphs (two of them are still not)