math/rand call refactoring #567
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Starting from Go 1.20, math/rand is automatically seeded at startup, and we don't have to manually call rand.Seed inside init().
Replace
rand.Int63()withrand.Uint64()to have an easy future transition tomath/rand/v2, since Int64 function has been removed in this library.Uint64() >> 1 is the equivalent function to always have the 0 value as the first bit, thus having a positive serial.