Marcin Tolysz

On that note could we have an option to show dates in "ISO 8601" format?

As long as it is possible to generate `null` or omit for the same key... it will be awesome. Adding `Missing` allows to generate instances... as if the leaf would...

On the object level we have only `Maybe` and we can only chose it once for every field... and there is no way to change it... we need to have...

`dat NullOrUndefined a = N' | U' | NullOrUndefined a` Anything 3 state is fine. In my universe I used `Possible`. You will need to add `Missing` to the `Object`...

Problem reoccurring all over: https://github.com/bos/aeson/issues/323 (https://github.com/bos/aeson/compare/master...tolysz:Missing_v10 ) really is the only sane answer :) Basically whan we have `ommit nothing` `Nothing` -> `Ommited` otherwise `Nothing` -> `Null` And it simply...

Sorry, I answered it there (now). I simply lost entropy to produce more constructive arguments. But the basic idea is to always omit the new constructor and always map Null...

With the proposed additional value ``` Nothing -> Ommited Just Just a -> toJson a Just Nothing -> Null But I guess a newtype wrapper would be better (eg. `Possible`)...

You are right: `Possible` is the exact type you say. My only problem is: `Maybe` is special in `aeson`. Records (`Map`s) are removing `Nothing` for all keys if some template...

Even if I make a `newtype` I will still have to deal with `omittableNothing` i.e. I will have to modify the type which imports my new one. Either way this...

Generic or not I will not be able to use "toJSON", but I will be able to do it via toEncoding, thus it is a partial answer. I.e. the way...