Kotlin @JvmField internal fields not being removed

[jpobst]

Context: https://github.com/Kotlin/kotlinx.coroutines/blob/master/kotlinx-coroutines-core/jvm/src/scheduling/Tasks.kt

When binding org.jetbrains.kotlinx.kotlinx-coroutines-core-jvm, the following Kotlin-internal fields are not being marked as private in the Java API.

• /api/package[@name='kotlinx.coroutines.scheduling']/class[@name='TasksKt']/field[@name='BlockingContext']
• /api/package[@name='kotlinx.coroutines.scheduling']/class[@name='TasksKt']/field[@name='NonBlockingContext']

This causes an issue because their type is a Kotlin-internal interface which is being removed from the Java API.

[jpobst]

Internal fields actually are correctly marked as private by Kotlin and thus we do not bind them:

internal val city: String = "London"

The issue here is that these internal fields are marked with @JvmField. This instructs Kotlin to make them public so they can be called by Java.

@JvmField internal val city: String = "London"

We are not checking for internal in the Kotlin field metadata.