@type as() :: map() | struct() | [as()] | (t() -> as())

@type decimal() :: boolean()

@type keys() :: :atoms | :atoms!

@type option() :: {:keys, keys()} | {:decimal, decimal()} | {:as, as()}

@type options() :: %{
  optional(:keys) => keys(),
  optional(:decimal) => decimal(),
  optional(:as) => as()
}

@type t() :: term()