add JSONObject type

[mesqueeb]

type Primitive =
  | bigint
  | boolean
  | null
  | number
  | string
  | symbol
  | undefined;

type JSONValue = Primitive | JSONObject | JSONArray;

interface JSONObject {
  [key: string]: JSONValue;
}

interface JSONArray extends Array<JSONValue> { }

[jcbhmr]

Would this be added to a isJSONObject() and friends collection of checking functions?