[JoshuaRLi]

Yeah, I was happy to see the switch away from C random/srandom or rand/srand.

Not my area either, but a little surprised why a PCG-family non-CSPRNG algorithm wasn’t used: https://www.pcg-random.org/posts/a-quick-look-at-xoshiro256....

PCG XSL RR 128/64 (MCG) could be used for 64-bit values (albeit with period 2^126 compared to xoroshiro256’s 2^256 − 1) with 128 bits. Half the state size than xoshiro256, and the performance might be comparable (would need benchmarking). LCG version if you want to trade PRNG quality for even more speed.