bos/aeson — Issue #66: Derived json instance should treat nullary constructor as plain strings.
Author: yihuang
Created: 2012-02-10 17:03:18+00:00
State: open

So json for enum data type will look mach better:

```
data Color = Red | Black | White

-- [Red, Black, White] -> ["Red", "Black", "White"]
```

I can make a patch as soon as possible, please tell me what you think.