t() :: %YNAB.BudgetSettings{
  currency_format: %YNAB.CurrencyFormat{
    currency_symbol: term(),
    decimal_digits: term(),
    decimal_separator: term(),
    display_symbol: term(),
    example_format: term(),
    group_separator: term(),
    iso_code: term(),
    symbol_first: term()
  },
  date_format: %YNAB.Format{format: term()}
}