Seed restriction in profanity-brute-force

[purgenetik]

Hi to all expects!

I have the following question related to initial seed in Dispatcher::createSeed() method.

In the original profanity code, seed generation is implemented as

std::random_device rd;
std::mt19937_64 eng(rd());

and in the current brute-force code, this is changed to:

std::random_device rd;
uint seed = rd();
seed = (1 << 18) + (seed) % (1 << 18);
std::mt19937_64 eng(seed);

which compresses the original 2^32 phase-space to 2^19

Could somebody explain, for what purpose it is done, and how is it then stated that we generate “all public keys using the profanity method” if squeezed phase space is used for initial seed generation in brute-force code in comparasion with original code?