{
  "version": "1.0.0",
  "date": "2026-10-23",
  "owner": "typechart.net",
  "thesis": "A versioned chart-only comparison separates existing-type rule changes from newly introduced types and shows exactly which one- and two-type defensive profiles change.",
  "method": "Enumerate unique singleton and unordered distinct type pairs within each era; multiply the disclosed defensive chart factors. Compare eras only over types shared by both, separately reporting newly added types.",
  "scope": "Three pinned chart families: Gen 1, Gen 2–5, Gen 6+. Mathematical one- and two-type sets; no abilities, moves, species availability, competitive ranking or full damage engine.",
  "reproduce": "python3 reproduce-v1.py",
  "networkRequired": false,
  "sourceInputs": "charts-v1.json",
  "dataInterpretation": "Computed reference outputs; no real-world frequency or accuracy estimate."
}