Use estimate_prime_pi to give a more precise size_hint.
Use estimate_prime_pi to give a more precise size_hint.

huonw/primal,cuviper/primal,wackywendell/primal,wackywendell/primal,Antiarchitect/primal,huonw/slow_primes,Antiarchitect/primal,huonw/primal,cuviper/primal