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kotlinlang

How does kotlinx.serialization (v 1.6.3) work with the new K2 (2.0.0-RC2) Kotlin compiler? I get the following warning in my maven project:
`[WARNING] Kapt currently doesn't support language version 2.0+. Falling back to 1.9.` Does the kotlin serialization plugin still rely on KAPT instead of KSP?

kotlinx.serialization does not use kapt or ksp, but its own compiler plugin so the warning is not related to kotlinx serialization. 

Then I don't understand where this comes from:
`[INFO] --- kotlin:2.0.0-RC2:kapt (default-kapt) @ client ---`
[INFO] Applied plugin: 'kotlinx-serialization'
[INFO] Applied plugin: 'spring'
[WARNING] Kapt currently doesn't support language version 2.0+. Falling back to 1.9.