Make convert{}.to{} consistent with replace{}.with{}. Add reified overload for colsOf

Author: koperagen

core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/api/ColumnsSelectionDsl.kt

@@ -358,6 +358,8 @@ public inline fun <reified C> ColumnSet<*>.dfsOf(noinline filter: (ColumnWithPat
 
 public fun ColumnSet<*>.colsOf(type: KType): ColumnSet<Any?> = colsOf(type) { true }
 
+public inline fun <reified C> ColumnSet<*>.colsOf(): ColumnSet<C> = colsOf(typeOf<C>()) as ColumnSet<C>
+
 public fun <C> ColumnSet<*>.colsOf(type: KType, filter: (DataColumn<C>) -> Boolean): ColumnSet<C> =
     colsInternal { it.isSubtypeOf(type) && filter(it.cast()) } as ColumnSet<C>
 

core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/api/convert.kt

@@ -5,6 +5,7 @@ import kotlinx.datetime.LocalDate
 import kotlinx.datetime.LocalDateTime
 import kotlinx.datetime.TimeZone
 import kotlinx.datetime.toLocalDateTime
+import org.jetbrains.kotlinx.dataframe.AnyBaseCol
 import org.jetbrains.kotlinx.dataframe.AnyCol
 import org.jetbrains.kotlinx.dataframe.AnyFrame
 import org.jetbrains.kotlinx.dataframe.ColumnsSelector
@@ -94,7 +95,7 @@ public inline fun <T, C, reified R> Convert<T, C>.perRowCol(
 ): DataFrame<T> =
     convertRowColumnImpl(typeOf<R>(), infer, expression)
 
-public fun <T, C> Convert<T, C>.to(columnConverter: DataFrame<T>.(DataColumn<C>) -> AnyCol): DataFrame<T> =
+public fun <T, C> Convert<T, C>.to(columnConverter: DataFrame<T>.(DataColumn<C>) -> AnyBaseCol): DataFrame<T> =
     df.replace(columns).with { columnConverter(df, it) }
 
 public inline fun <reified C> AnyCol.convertTo(): DataColumn<C> = convertTo(typeOf<C>()) as DataColumn<C>