@type t() :: %Poolex.Private.DebugInfo{
  busy_workers_count: non_neg_integer(),
  busy_workers_impl: module(),
  busy_workers_pids: [pid()],
  idle_workers_count: non_neg_integer(),
  idle_workers_impl: module(),
  idle_workers_pids: [pid()],
  max_overflow: non_neg_integer(),
  overflow: non_neg_integer(),
  waiting_callers: [pid()],
  waiting_callers_impl: module(),
  worker_args: [any()],
  worker_module: module(),
  worker_start_fun: atom()
}