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kotlinlang

It's really nice of Ktor to use different defaults for serialization on the client-side and on the server-side. Just took me about a day to understand why KotlinX.Serialization wouldn't work.
Ktor 1.6.0 server-side, `JsonSupport.kt:54`
```useArrayPolymorphism = true```
 Ktor 1.6.0 client-side, `KotlinxSerializer.kt:64`
```useArrayPolymorphism = false```
 Where should I report that? GitHub, YouTrack?

I think you should create a youtrack issue for htis

This will mess up anyone migrating to 1.6.0

Here it is <https://youtrack.jetbrains.com/issue/KTOR-2817>