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Json4s uses the old reflection features of pre-2.9 Scala and cannot distinguish between implicit parameters. To do this, we need to replace the Json4s code base with the new reflection...

I will write a patch for this proposal if there is a request at this time.

The issue seems to be resolved, so close it. If you have another problem, open an issue

Is this message output in the latest version? I could not reproduce.

As you pointed out, `getDeclaredFields` can access private fields, so a warning is issued after Java 10. We need to use a different approach, as access to private fields in...

@olkinn It is better to avoid changing existing behavior from the viewpoint of backward compatibility, but if there are many requests, I think that it is possible to add a...

I wrote the minimum code to reproduce. ```scala Welcome to Scala 2.13.1 (OpenJDK 64-Bit Server VM, Java 13.0.1). Type in expressions for evaluation. Or try :help. scala> import org.json4s._ import...

With the old reflection API, it is not possible to determine which constructor is the primary constructor unless specified in annotations. As a result, it seems that `this()` is applied...

@mccartney Sorry for the very late reply. @tjarvstrand is right. And considering that Scala3 won't provide those APIs either, I don't think it's a good choice to rewrite them now!...

So I think it is more appropriate to keep this issue as a limitation in the documentation.