docs: private static UUID generateRandomUuid() {
          final Random rnd = ThreadLocalRandom.current();
          long mostSig  = rnd.nextLong();
          long leastSig = rnd.nextLong();
  
          // Identify this as a version 4 UUID, that is one based on a random value.
          mostSig &= 0xffffffffffff0fffL;
          mostSig |= 0x0000000000004000L;
  
          // Set the variant identifier as specified for version 4 UUID values.  The two
          // high order bits of the lower word are required to be one and zero, respectively.
          leastSig &= 0x3fffffffffffffffL;
          leastSig |= 0x8000000000000000L;
  
          return new UUID(mostSig, leastSig);
      }