hard_forks

raw details (from release v2.2.3):

{
  "name": "hard_forks",
  "properties": {
    "long": "hard-fork",
    "value_name": "SLOT",
    "validator": "is_slot",
    "multiple": "true",
    "takes_value": "true",
    "help": "Add a hard fork at this slot"
  },
  "isDeprecated": false
}