// integer.
	strToInt := func(s string) (int64, bool) {
		i, errI := strconv.ParseInt(s, 10, 64)
		if errI == nil {
			return i, true
		}
		f, errF := strconv.ParseFloat(s, 64)
		if errF == nil {
			return int64(f), true
		}
		return 0, false
	}

	switch x := v.value.(type) {
	case float64:
		// Truncate fractional part
		return int64(x), nil
	case int64: