assignOp: replace `n = n / encodeDictSize` with `n /= encodeDictSize` (gocritic)

S1019: should use make([]string, 12) instead (gosimple)

SA1019: rand.Seed has been deprecated since Go 1.20 and an alternative has been available since Go 1.0: Programs that call Seed and then expect a specific sequence of results from the global random source (using functions such as Int) can be broken when a dependency changes how much it consumes from the global random source. To avoid such breakages, programs that need a specific result sequence should use NewRand(NewSource(seed)) to obtain a random generator that other packages cannot access. (staticcheck)

issues found