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bissell

05/28/2018, 12:40 AM
^ just checked Gson and it looks like they do this as well, at least with default settings. You can freely mix 
5
and 
"5"
and into fields of int/String type and the parser will not generate an error. I dunno, seems to me like "the wrong thing" to do
s

sandwwraith

05/28/2018, 12:42 PM
Is there any example of library that actually supports such unions?
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bissell

05/29/2018, 7:24 AM
There are at least a couple of approaches that work in Jackson: https://gist.github.com/abissell/a93f642c54daad3fdae4b0714c134e57
One method is to register alternative deserializers for String, Integer, and Long, which inspect the JSON type of the current token and refuse to deserialize a mismatched one. This works -- my implementation uses exception generation but I think it might be possible to get it to work with 
null
instead. The other method is to just deserialize to a 
Map<String, Object>
and then inspect the type that Jackson picked.
Maybe I need to play with 
SerialContext
a bit, I see the docs say they're similar to Jackson modules. Would still prefer to create a 
KSerializer
that can be resolved by the plugin at compile time if possible though.
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