NewDealer will create a Dealer with the given deckSize and handSize, will return error when deckSize or handSize is invalid as below.

RequiredEntropyBits makes a quick and slightly conservative estimate of the number of bits of hash value that are consumed in shuffle sharding a deck of the given size to a hand of the given size.

MaxHashBits is the max bit length which can be used from hash value.

Dealer contains some necessary parameters and provides some methods for shuffle sharding.