code: func (t Typed) FloatIf(key string) (float64, bool) {
  	value, exists := t[key]
  	if exists == false {
  		return 0, false
  	}
  	switch t := value.(type) {
  	case float64:
  		return t, true
  	case string:
  		f, err := strconv.ParseFloat(t, 10)
  		return f, err == nil
  	}
  	return 0, false
  }
docs: // Returns an float at the key and whether
  // or not the key existed and the value was an float