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kotlinlang

I've just hit a bug in kotlinx.serialization when trying to migrate my fullstack app to new KVision :disappointed:
<https://github.com/Kotlin/kotlinx.serialization/issues/1464>
Complete disaster ... no workaround possible.
If you exchange a lot of string data in your fullstack KVision app, better stay with 4.4 until a fix is released.

Yeah I tried out Serialization 1.2 with the 1.5 IR backend and the performance of my KVision app really dropped. I think Serialization 1.2 requires the IR backend, but the JS IR backend is still in alpha and has no optimizations in place yet. I do a lot of work with collections for my WebGL components, and these are heavily affected.

`kotlinx.serialization` should work with old compiler backend, except new things implemented in 1.2 like value classes support. Please let us know if you have any problem with it.

I see this issue when using 1.2 with the legacy backend:

<https://youtrack.jetbrains.com/issue/KT-46598>