ValidationResult was already made covariant in #56. This improves upon that by making Invalid invariant and extend ValidationResult<Nothing>, which is possible since Invalid does not hold the result, only the errors.
Additionally, make map an inline function which improves performance.
ValidationResult was already made covariant in #56. This improves upon that by making
Invalidinvariant and extendValidationResult<Nothing>, which is possible sinceInvaliddoes not hold the result, only the errors.Additionally, make
mapan inline function which improves performance.