Hello! Could anybody please explain what is happening here? From this docs: <https://github.com/Kotl...

# getting-started

[Zakhar]

Hello! Could anybody please explain what is happening here? From this docs: https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/polymorphism.md#open-polymorphism we see that the serializers module keeps in the log "type" filed.
I did the same thing and for me the module deletes the "type" field.

[Adam S]

The example has explicitly set the type of val data to be Project, which is polymorphic.

val data: Project = OwnedProject("kotlinx.coroutines", "kotlin")

while in your code val data has an inferred type of OwnedProject, which is not polymorphic and does not require a type field

val data = OwnedProject("kotlinx.coroutines", "kotlin")

[Zakhar]

Really 🤦 thanks!
Another way:

val data = OwnedProject("kotlinx.coroutines", "kotlin")
println(format.encodeToString<Project>(data))

[Jacob Ras]

Oof! Just lost an hour over this, thanks a lot @Adam S!