Kernel uses serialization runtime from itself, not the library

[altavir]

@file:DependsOn("org.jetbrains.kotlinx:kotlinx-serialization-core-jvm:1.1.0")
import kotlinx.serialization.builtins.*
Boolean.serializer().descriptor.isInline

isInline property is available in serialization 1.1.0, but Jupyter can't find it. In the current version (0.8.3.275) serialization, 1.0.1 is used so it probably takes serialization from there.

[altavir]

The latest build (0.8.3.279) Indeed fixes the problem, but it is only a workaround. Platform serialization should not leak into the notebook content.

[ileasile]

Problem should be fixed in 0.8.3.280
See commit adaadf2