-record(state, {
    selector :: gleam@erlang@process:selector(any()),
    max_size :: integer(),
    current_size :: integer(),
    handle_open :: fun(() -> {ok, any()} | {error, any()}),
    handle_close :: fun((any()) -> {ok, nil} | {error, any()}),
    handle_interval :: fun((any()) -> nil),
    interval :: integer(),
    idle :: list(any()),
    active :: gleam@dict:dict(gleam@erlang@process:pid_(), db_pool@internal@state:active(any())),
    queue :: db_pool@internal@queue:queue(integer(), db_pool@internal@state:waiting(any(), any()))
}).