code: func (v *Value) Int64() (int64, error) {
  	n, err := v.Number()
  
  	if err != nil {
  		return 0, err
  	}
  
  	return n.Int64()
  }
docs: // Attempts to typecast the current value into a int64.
  // Returns error if the current value is not a json number.
  // Example:
  //		id, err := v.Int64()