then how is that possible? ```cpp struct ArchetypeEdge { Archetype& add; Archetype& remove; };

struct ArchetypeEdge {
  Archetype& add;
  Archetype& remove;
};

struct Archetype {
  ArchetypeId id;
  Type type;
  vector<Column> components;
  unordered_map<ComponentId, ArchetypeEdge> edges;
};