core/org.jetbrains.kotlinx.dataframe.api/CreateDataFrameDsl/preserve

preserve

fun ~~preserve~~(vararg classes: KClass<*>)

fun ~~preserve~~(vararg properties: KCallable<*>)

Deprecated (with error)

Top-level `exclude`/`preserve` calls in `toDataFrame {}` are deprecated. Move them into each `properties { }` block to configure traversal instead. Will be ERROR in 1.0.