DefaultOptions returns an `SaltOptions` instance with no limits or restrictions save a minimum length of 32 bytes.

IsValidSalt returns a boolean value indicating whether 's' can be used a salt.

NewRandomSalt return a new `Salt` instance for a random string configured by 'opts'.

NewSaltFromString returns a new `Salt` instance derived from 's'.

Salt is a struct containing methods and values that can be used as (hashing) salts.

SaltOptions is a struct containing configuration options for the `NewRandomSalt` method.