code: func InvalidCollectionFormat(name, in, format string) *Validation {
  	return &Validation{
  		code:    InvalidTypeCode,
  		Name:    name,
  		In:      in,
  		Value:   format,
  		message: fmt.Sprintf("the collection format %q is not supported for the %s param %q", format, in, name),
  	}
  }
docs: // InvalidCollectionFormat another flavor of invalid type error