{
  "keys": [
    {
      "name": "fuel",
      "role": "input",
      "type": "fluid_stack"
    },
    {
      "name": "total_energy",
      "type": "non_negative_int"
    },
    {
      "name": "burn_time",
      "type": "ticks"
    }
  ],
  "unique": ["fuel"]
}
