@type body() :: [term()]

@type guard() :: atom() | tuple()

@type guards() :: [guard()]

@type key() :: term()

@type keys() :: :unique | :duplicate

@type match_pattern() :: atom() | term()

@type meta_key() :: atom() | tuple()

@type meta_value() :: term()

@type registry() :: atom()

@type spec() :: [{match_pattern(), guards(), body()}]

@type start_option() ::
  {:keys, keys()}
  | {:name, registry()}
  | {:partitions, pos_integer()}
  | {:listeners, [atom()]}
  | {:meta, [{meta_key(), meta_value()}]}

@type value() :: term()