redis v9 introduced a PoolFifo option that ths library does not pass on.
// PoolFIFO type of connection pool.
//
// - true for FIFO pool
// - false for LIFO pool.
//
// Note that FIFO has slightly higher overhead compared to LIFO,
// but it helps closing idle connections faster reducing the pool size.
PoolFIFO bool
redis v9 introduced a PoolFifo option that ths library does not pass on.