{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "http://jsonlogic.com/schemas/operators/logic/notnot.json",

  "title": "!!",
  "description": "Double negation, or “cast to a boolean.” Takes a single argument.",

  "type": "object",
  "additionalProperties": false,
  "required": ["!!"],
  "properties": {
    "!!": {
      "$ref": "http://jsonlogic.com/schemas/common/unary-arg.json"
    }
  },
  "examples": [
    { "!!": [ [] ] },
    { "!!": ["0"] }
  ]
}