When marshaling To go code, option to not marshall zero values

[thomaspeugeot]

Rationale for the change is to limit the size of the go persistance file.

A drawback is that the values cannot be easily set if the file is missing. Solution is to have an option in the persistance.

func Zero[T any]() (_ T) {
  return
}

func main() {

  fmt.Println("%v", Zero[int]()) 
}