diff --git a/build.gradle.kts b/build.gradle.kts
index 6e9893cb..28bccc9b 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -21,4 +21,8 @@ allprojects {
 
 subprojects {
     apply(plugin = "ru.mipt.npm.publish")
+}
+
+apiValidation{
+    ignoredProjects.add("dataforge-tables")
 }
\ No newline at end of file
diff --git a/dataforge-io/dataforge-io-yaml/api/dataforge-io-yaml.api b/dataforge-io/dataforge-io-yaml/api/dataforge-io-yaml.api
index de7b3ab2..d137dcdc 100644
--- a/dataforge-io/dataforge-io-yaml/api/dataforge-io-yaml.api
+++ b/dataforge-io/dataforge-io-yaml/api/dataforge-io-yaml.api
@@ -57,3 +57,10 @@ public final class hep/dataforge/io/yaml/YamlMetaFormat$Companion : hep/dataforg
 	public synthetic fun writeObject (Lkotlinx/io/Output;Ljava/lang/Object;)V
 }
 
+public final class hep/dataforge/io/yaml/YamlMetaFormatKt {
+	public static final fun toMeta (Lnet/mamoe/yamlkt/YamlMap;)Lhep/dataforge/meta/Meta;
+	public static final fun toMetaItem (Lnet/mamoe/yamlkt/YamlElement;Lhep/dataforge/meta/descriptors/ItemDescriptor;)Lhep/dataforge/meta/MetaItem;
+	public static synthetic fun toMetaItem$default (Lnet/mamoe/yamlkt/YamlElement;Lhep/dataforge/meta/descriptors/ItemDescriptor;ILjava/lang/Object;)Lhep/dataforge/meta/MetaItem;
+	public static final fun toYaml (Lhep/dataforge/meta/Meta;)Lnet/mamoe/yamlkt/YamlMap;
+}
+
diff --git a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/MetaSerializer.kt b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/MetaSerializer.kt
index ef7be41c..81730b5d 100644
--- a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/MetaSerializer.kt
+++ b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/MetaSerializer.kt
@@ -12,13 +12,12 @@ import kotlinx.serialization.json.JsonDecoder
 import kotlinx.serialization.json.JsonEncoder
 import kotlinx.serialization.json.JsonObject
 
-@OptIn(ExperimentalSerializationApi::class)
 public object MetaItemSerializer : KSerializer<MetaItem<*>> {
 
-    @OptIn(InternalSerializationApi::class)
-    override val descriptor: SerialDescriptor = buildClassSerialDescriptor("hep.dataforge.meta.MetaItem") {
+    @OptIn(InternalSerializationApi::class, ExperimentalSerializationApi::class)
+    override val descriptor: SerialDescriptor = buildSerialDescriptor("MetaItem", PolymorphicKind.SEALED) {
         element<Boolean>("isNode")
-        element("content", buildSerialDescriptor("MetaItem.content", SerialKind.CONTEXTUAL))
+        element("value", buildSerialDescriptor("MetaItem.value", SerialKind.CONTEXTUAL))
     }
 
     override fun deserialize(decoder: Decoder): MetaItem<*> {
diff --git a/dataforge-tables/api/dataforge-tables.api b/dataforge-tables/api/dataforge-tables.api
deleted file mode 100644
index e037773a..00000000
--- a/dataforge-tables/api/dataforge-tables.api
+++ /dev/null
@@ -1,302 +0,0 @@
-public final class hep/dataforge/tables/CachedTransformationColumn : hep/dataforge/tables/Column {
-	public fun <init> (Lhep/dataforge/tables/Table;Lkotlin/reflect/KClass;Ljava/lang/String;Lhep/dataforge/meta/Meta;Lkotlin/jvm/functions/Function1;)V
-	public fun get (I)Ljava/lang/Object;
-	public final fun getMapper ()Lkotlin/jvm/functions/Function1;
-	public fun getMeta ()Lhep/dataforge/meta/Meta;
-	public fun getName ()Ljava/lang/String;
-	public fun getSize ()I
-	public final fun getTable ()Lhep/dataforge/tables/Table;
-	public fun getType ()Lkotlin/reflect/KClass;
-}
-
-public final class hep/dataforge/tables/CastColumn : hep/dataforge/tables/Column {
-	public fun <init> (Lhep/dataforge/tables/Column;Lkotlin/reflect/KClass;)V
-	public fun get (I)Ljava/lang/Object;
-	public fun getMeta ()Lhep/dataforge/meta/Meta;
-	public fun getName ()Ljava/lang/String;
-	public final fun getOrigin ()Lhep/dataforge/tables/Column;
-	public fun getSize ()I
-	public fun getType ()Lkotlin/reflect/KClass;
-}
-
-public final class hep/dataforge/tables/CastColumnKt {
-	public static final fun cast (Lhep/dataforge/tables/Column;Lkotlin/reflect/KClass;)Lhep/dataforge/tables/Column;
-	public static final fun get (Ljava/util/Collection;Lhep/dataforge/tables/ColumnHeader;)Lhep/dataforge/tables/Column;
-}
-
-public abstract interface class hep/dataforge/tables/Column : hep/dataforge/tables/ColumnHeader {
-	public abstract fun get (I)Ljava/lang/Object;
-	public abstract fun getSize ()I
-}
-
-public final class hep/dataforge/tables/ColumnDef : hep/dataforge/tables/ColumnHeader {
-	public fun <init> (Ljava/lang/String;Lkotlin/reflect/KClass;Lhep/dataforge/meta/Meta;)V
-	public final fun component1 ()Ljava/lang/String;
-	public final fun component2 ()Lkotlin/reflect/KClass;
-	public final fun component3 ()Lhep/dataforge/meta/Meta;
-	public final fun copy (Ljava/lang/String;Lkotlin/reflect/KClass;Lhep/dataforge/meta/Meta;)Lhep/dataforge/tables/ColumnDef;
-	public static synthetic fun copy$default (Lhep/dataforge/tables/ColumnDef;Ljava/lang/String;Lkotlin/reflect/KClass;Lhep/dataforge/meta/Meta;ILjava/lang/Object;)Lhep/dataforge/tables/ColumnDef;
-	public fun equals (Ljava/lang/Object;)Z
-	public fun getMeta ()Lhep/dataforge/meta/Meta;
-	public fun getName ()Ljava/lang/String;
-	public fun getType ()Lkotlin/reflect/KClass;
-	public fun hashCode ()I
-	public fun toString ()Ljava/lang/String;
-}
-
-public abstract interface class hep/dataforge/tables/ColumnHeader {
-	public abstract fun getMeta ()Lhep/dataforge/meta/Meta;
-	public abstract fun getName ()Ljava/lang/String;
-	public abstract fun getType ()Lkotlin/reflect/KClass;
-}
-
-public final class hep/dataforge/tables/ColumnHeaderKt {
-	public static final fun getTextWidth (Lhep/dataforge/tables/ColumnHeader;)I
-	public static final fun getValueType (Lhep/dataforge/tables/ColumnHeader;)Lhep/dataforge/values/ValueType;
-}
-
-public final class hep/dataforge/tables/ColumnProperty : kotlin/properties/ReadOnlyProperty {
-	public fun <init> (Lhep/dataforge/tables/Table;Lkotlin/reflect/KClass;)V
-	public final fun getTable ()Lhep/dataforge/tables/Table;
-	public final fun getType ()Lkotlin/reflect/KClass;
-	public fun getValue (Ljava/lang/Object;Lkotlin/reflect/KProperty;)Lhep/dataforge/tables/Column;
-	public synthetic fun getValue (Ljava/lang/Object;Lkotlin/reflect/KProperty;)Ljava/lang/Object;
-}
-
-public class hep/dataforge/tables/ColumnScheme : hep/dataforge/meta/Scheme {
-	public static final field Companion Lhep/dataforge/tables/ColumnScheme$Companion;
-	public fun <init> ()V
-	public final fun getTitle ()Ljava/lang/String;
-	public final fun setTitle (Ljava/lang/String;)V
-}
-
-public final class hep/dataforge/tables/ColumnScheme$Companion : hep/dataforge/meta/SchemeSpec {
-}
-
-public final class hep/dataforge/tables/ColumnTable : hep/dataforge/tables/Table {
-	public fun <init> (Ljava/util/Collection;)V
-	public fun getColumns ()Ljava/util/Collection;
-	public fun getHeader ()Ljava/util/List;
-	public fun getRows ()Ljava/util/List;
-	public fun getValue (ILjava/lang/String;)Ljava/lang/Object;
-	public fun rowFlow ()Lkotlinx/coroutines/flow/Flow;
-}
-
-public final class hep/dataforge/tables/IntColumn : hep/dataforge/tables/Column {
-	public static final field Companion Lhep/dataforge/tables/IntColumn$Companion;
-	public fun <init> (Ljava/lang/String;[ILhep/dataforge/meta/Meta;)V
-	public synthetic fun <init> (Ljava/lang/String;[ILhep/dataforge/meta/Meta;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
-	public fun equals (Ljava/lang/Object;)Z
-	public fun get (I)Ljava/lang/Integer;
-	public synthetic fun get (I)Ljava/lang/Object;
-	public final fun getData ()[I
-	public fun getMeta ()Lhep/dataforge/meta/Meta;
-	public fun getName ()Ljava/lang/String;
-	public fun getSize ()I
-	public fun getType ()Lkotlin/reflect/KClass;
-	public fun hashCode ()I
-}
-
-public final class hep/dataforge/tables/IntColumn$Companion {
-}
-
-public final class hep/dataforge/tables/ListColumn : hep/dataforge/tables/Column {
-	public static final field Companion Lhep/dataforge/tables/ListColumn$Companion;
-	public fun <init> (Ljava/lang/String;Ljava/util/List;Lkotlin/reflect/KClass;Lhep/dataforge/meta/Meta;)V
-	public fun get (I)Ljava/lang/Object;
-	public fun getMeta ()Lhep/dataforge/meta/Meta;
-	public fun getName ()Ljava/lang/String;
-	public fun getSize ()I
-	public fun getType ()Lkotlin/reflect/KClass;
-}
-
-public final class hep/dataforge/tables/ListColumn$Companion {
-}
-
-public final class hep/dataforge/tables/MapRow : hep/dataforge/tables/Row {
-	public static final synthetic fun box-impl (Ljava/util/Map;)Lhep/dataforge/tables/MapRow;
-	public static fun constructor-impl (Ljava/util/Map;)Ljava/util/Map;
-	public fun equals (Ljava/lang/Object;)Z
-	public static fun equals-impl (Ljava/util/Map;Ljava/lang/Object;)Z
-	public static final fun equals-impl0 (Ljava/util/Map;Ljava/util/Map;)Z
-	public fun getValue (Ljava/lang/String;)Ljava/lang/Object;
-	public static fun getValue-impl (Ljava/util/Map;Ljava/lang/String;)Ljava/lang/Object;
-	public fun hashCode ()I
-	public static fun hashCode-impl (Ljava/util/Map;)I
-	public fun toString ()Ljava/lang/String;
-	public static fun toString-impl (Ljava/util/Map;)Ljava/lang/String;
-	public final synthetic fun unbox-impl ()Ljava/util/Map;
-}
-
-public final class hep/dataforge/tables/MutableColumnTable : hep/dataforge/tables/Table {
-	public fun <init> (I)V
-	public final fun add (Lhep/dataforge/tables/Column;)V
-	public synthetic fun getColumns ()Ljava/util/Collection;
-	public fun getColumns ()Ljava/util/List;
-	public fun getHeader ()Ljava/util/List;
-	public fun getRows ()Ljava/util/List;
-	public final fun getSize ()I
-	public fun getValue (ILjava/lang/String;)Ljava/lang/Object;
-	public final fun insert (ILhep/dataforge/tables/Column;)V
-	public fun rowFlow ()Lkotlinx/coroutines/flow/Flow;
-}
-
-public final class hep/dataforge/tables/MutableTable : hep/dataforge/tables/RowTable {
-	public fun <init> (Ljava/util/List;Ljava/util/List;)V
-	public final fun column (Ljava/lang/String;Lkotlin/reflect/KClass;Lhep/dataforge/meta/Meta;)Lhep/dataforge/tables/ColumnHeader;
-	public fun getHeader ()Ljava/util/List;
-	public fun getRows ()Ljava/util/List;
-	public final fun row (Ljava/util/Map;)Lhep/dataforge/tables/Row;
-	public final fun row ([Lkotlin/Pair;)Lhep/dataforge/tables/Row;
-}
-
-public final class hep/dataforge/tables/MutableTableKt {
-	public static final fun edit (Lhep/dataforge/tables/Table;Lkotlin/jvm/functions/Function1;)Lhep/dataforge/tables/Table;
-	public static final fun row (Lhep/dataforge/tables/MutableTable;[Lkotlin/Pair;)Lhep/dataforge/tables/Row;
-}
-
-public final class hep/dataforge/tables/RealColumn : hep/dataforge/tables/Column {
-	public static final field Companion Lhep/dataforge/tables/RealColumn$Companion;
-	public fun <init> (Ljava/lang/String;[DLhep/dataforge/meta/Meta;)V
-	public synthetic fun <init> (Ljava/lang/String;[DLhep/dataforge/meta/Meta;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
-	public fun equals (Ljava/lang/Object;)Z
-	public fun get (I)Ljava/lang/Double;
-	public synthetic fun get (I)Ljava/lang/Object;
-	public final fun getData ()[D
-	public fun getMeta ()Lhep/dataforge/meta/Meta;
-	public fun getName ()Ljava/lang/String;
-	public fun getSize ()I
-	public fun getType ()Lkotlin/reflect/KClass;
-	public fun hashCode ()I
-}
-
-public final class hep/dataforge/tables/RealColumn$Companion {
-}
-
-public abstract interface class hep/dataforge/tables/Row {
-	public abstract fun getValue (Ljava/lang/String;)Ljava/lang/Object;
-}
-
-public class hep/dataforge/tables/RowTable : hep/dataforge/tables/Table {
-	public fun <init> (Ljava/util/List;Ljava/util/List;)V
-	public synthetic fun getColumns ()Ljava/util/Collection;
-	public fun getColumns ()Ljava/util/List;
-	public fun getHeader ()Ljava/util/List;
-	public fun getRows ()Ljava/util/List;
-	public fun getValue (ILjava/lang/String;)Ljava/lang/Object;
-	public fun rowFlow ()Lkotlinx/coroutines/flow/Flow;
-}
-
-public final class hep/dataforge/tables/RowTableKt {
-	public static final fun collect (Lhep/dataforge/tables/Rows;Lkotlin/coroutines/Continuation;)Ljava/lang/Object;
-}
-
-public abstract interface class hep/dataforge/tables/Rows {
-	public abstract fun getHeader ()Ljava/util/List;
-	public abstract fun rowFlow ()Lkotlinx/coroutines/flow/Flow;
-}
-
-public final class hep/dataforge/tables/SimpleColumnHeader : hep/dataforge/tables/ColumnHeader {
-	public fun <init> (Ljava/lang/String;Lkotlin/reflect/KClass;Lhep/dataforge/meta/Meta;)V
-	public final fun component1 ()Ljava/lang/String;
-	public final fun component2 ()Lkotlin/reflect/KClass;
-	public final fun component3 ()Lhep/dataforge/meta/Meta;
-	public final fun copy (Ljava/lang/String;Lkotlin/reflect/KClass;Lhep/dataforge/meta/Meta;)Lhep/dataforge/tables/SimpleColumnHeader;
-	public static synthetic fun copy$default (Lhep/dataforge/tables/SimpleColumnHeader;Ljava/lang/String;Lkotlin/reflect/KClass;Lhep/dataforge/meta/Meta;ILjava/lang/Object;)Lhep/dataforge/tables/SimpleColumnHeader;
-	public fun equals (Ljava/lang/Object;)Z
-	public fun getMeta ()Lhep/dataforge/meta/Meta;
-	public fun getName ()Ljava/lang/String;
-	public fun getType ()Lkotlin/reflect/KClass;
-	public fun hashCode ()I
-	public fun toString ()Ljava/lang/String;
-}
-
-public abstract interface class hep/dataforge/tables/Table : hep/dataforge/tables/Rows {
-	public static final field Companion Lhep/dataforge/tables/Table$Companion;
-	public abstract fun getColumns ()Ljava/util/Collection;
-	public abstract fun getHeader ()Ljava/util/List;
-	public abstract fun getRows ()Ljava/util/List;
-	public abstract fun getValue (ILjava/lang/String;)Ljava/lang/Object;
-	public abstract fun rowFlow ()Lkotlinx/coroutines/flow/Flow;
-}
-
-public final class hep/dataforge/tables/Table$Companion {
-	public final fun invoke (Lkotlin/jvm/functions/Function1;)Lhep/dataforge/tables/Table;
-}
-
-public final class hep/dataforge/tables/Table$DefaultImpls {
-	public static fun getHeader (Lhep/dataforge/tables/Table;)Ljava/util/List;
-	public static fun rowFlow (Lhep/dataforge/tables/Table;)Lkotlinx/coroutines/flow/Flow;
-}
-
-public final class hep/dataforge/tables/TableKt {
-	public static final fun get (Lhep/dataforge/tables/Row;Lhep/dataforge/tables/ColumnHeader;)Ljava/lang/Object;
-	public static final fun get (Lhep/dataforge/tables/Table;ILhep/dataforge/tables/ColumnHeader;)Ljava/lang/Object;
-	public static final fun get (Ljava/util/Collection;Ljava/lang/String;)Lhep/dataforge/tables/Column;
-	public static final fun getIndices (Lhep/dataforge/tables/Column;)Lkotlin/ranges/IntRange;
-	public static final fun getValue (Lhep/dataforge/tables/Row;Ljava/lang/String;Lkotlin/reflect/KClass;)Ljava/lang/Object;
-	public static final fun getValue (Lhep/dataforge/tables/Table;ILjava/lang/String;Lkotlin/reflect/KClass;)Ljava/lang/Object;
-	public static final fun iterator (Lhep/dataforge/tables/Column;)Ljava/util/Iterator;
-}
-
-public final class hep/dataforge/tables/TransformationColumn : hep/dataforge/tables/Column {
-	public fun <init> (Lhep/dataforge/tables/Table;Lkotlin/reflect/KClass;Ljava/lang/String;Lhep/dataforge/meta/Meta;Lkotlin/jvm/functions/Function1;)V
-	public fun get (I)Ljava/lang/Object;
-	public final fun getMapper ()Lkotlin/jvm/functions/Function1;
-	public fun getMeta ()Lhep/dataforge/meta/Meta;
-	public fun getName ()Ljava/lang/String;
-	public fun getSize ()I
-	public final fun getTable ()Lhep/dataforge/tables/Table;
-	public fun getType ()Lkotlin/reflect/KClass;
-}
-
-public final class hep/dataforge/tables/TransformationColumnKt {
-	public static final fun mapRowsToDouble (Lhep/dataforge/tables/Table;Ljava/lang/String;Lhep/dataforge/meta/Meta;Lkotlin/jvm/functions/Function1;)Lhep/dataforge/tables/RealColumn;
-	public static synthetic fun mapRowsToDouble$default (Lhep/dataforge/tables/Table;Ljava/lang/String;Lhep/dataforge/meta/Meta;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lhep/dataforge/tables/RealColumn;
-	public static final fun mapRowsToInt (Lhep/dataforge/tables/Table;Ljava/lang/String;Lhep/dataforge/meta/Meta;Lkotlin/jvm/functions/Function1;)Lhep/dataforge/tables/IntColumn;
-	public static synthetic fun mapRowsToInt$default (Lhep/dataforge/tables/Table;Ljava/lang/String;Lhep/dataforge/meta/Meta;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lhep/dataforge/tables/IntColumn;
-}
-
-public final class hep/dataforge/tables/ValueColumnScheme : hep/dataforge/tables/ColumnScheme {
-	public fun <init> ()V
-	public final fun getValueType ()Lhep/dataforge/values/ValueType;
-	public final fun setValueType (Lhep/dataforge/values/ValueType;)V
-}
-
-public final class hep/dataforge/tables/io/TextRows : hep/dataforge/tables/Rows {
-	public static final field Companion Lhep/dataforge/tables/io/TextRows$Companion;
-	public fun <init> (Ljava/util/List;Lkotlinx/io/Binary;)V
-	public fun getHeader ()Ljava/util/List;
-	public final fun indexFlow ()Lkotlinx/coroutines/flow/Flow;
-	public fun rowFlow ()Lkotlinx/coroutines/flow/Flow;
-}
-
-public final class hep/dataforge/tables/io/TextRows$Companion {
-}
-
-public final class hep/dataforge/tables/io/TextRowsKt {
-	public static final fun buildRowIndex (Lhep/dataforge/tables/io/TextRows;Lkotlin/coroutines/Continuation;)Ljava/lang/Object;
-	public static final fun writeRows (Lkotlinx/io/Output;Lhep/dataforge/tables/Rows;Lkotlin/coroutines/Continuation;)Ljava/lang/Object;
-}
-
-public final class hep/dataforge/tables/io/TextTable : hep/dataforge/tables/Table {
-	public static final field Companion Lhep/dataforge/tables/io/TextTable$Companion;
-	public fun <init> (Ljava/util/List;Lkotlinx/io/Binary;Ljava/util/List;)V
-	public fun getColumns ()Ljava/util/Collection;
-	public fun getHeader ()Ljava/util/List;
-	public final fun getIndex ()Ljava/util/List;
-	public fun getRows ()Ljava/util/List;
-	public fun getValue (ILjava/lang/String;)Lhep/dataforge/values/Value;
-	public synthetic fun getValue (ILjava/lang/String;)Ljava/lang/Object;
-	public fun rowFlow ()Lkotlinx/coroutines/flow/Flow;
-}
-
-public final class hep/dataforge/tables/io/TextTable$Companion {
-	public final fun invoke (Ljava/util/List;Lkotlinx/io/Binary;Lkotlin/coroutines/Continuation;)Ljava/lang/Object;
-}
-
-public final class hep/dataforge/tables/io/TextTableEnvelopeKt {
-	public static final fun readEnvelope (Lhep/dataforge/tables/io/TextRows$Companion;Lhep/dataforge/io/Envelope;)Lhep/dataforge/tables/io/TextRows;
-	public static final fun wrap (Lhep/dataforge/tables/Table;Lkotlin/coroutines/Continuation;)Ljava/lang/Object;
-}
-
diff --git a/dataforge-tables/src/jvmMain/kotlin/hep/dataforge/tables/CastColumn.kt b/dataforge-tables/src/jvmMain/kotlin/hep/dataforge/tables/CastColumn.kt
index a0bcb75e..6990f1c6 100644
--- a/dataforge-tables/src/jvmMain/kotlin/hep/dataforge/tables/CastColumn.kt
+++ b/dataforge-tables/src/jvmMain/kotlin/hep/dataforge/tables/CastColumn.kt
@@ -8,7 +8,7 @@ import kotlin.reflect.full.cast
 import kotlin.reflect.full.isSubclassOf
 
 @Suppress("UNCHECKED_CAST")
-fun <T : Any> Column<*>.cast(type: KClass<out T>): Column<T> {
+public fun <T : Any> Column<*>.cast(type: KClass<out T>): Column<T> {
     return if (type.isSubclassOf(this.type)) {
         this as Column<T>
     } else {
@@ -16,7 +16,7 @@ fun <T : Any> Column<*>.cast(type: KClass<out T>): Column<T> {
     }
 }
 
-class CastColumn<T : Any>(val origin: Column<*>, override val type: KClass<out T>) : Column<T> {
+public class CastColumn<T : Any>(private val origin: Column<*>, override val type: KClass<out T>) : Column<T> {
     override val name: String get() = origin.name
     override val meta: Meta get() = origin.meta
     override val size: Int get() = origin.size
@@ -25,12 +25,12 @@ class CastColumn<T : Any>(val origin: Column<*>, override val type: KClass<out T
     override fun get(index: Int): T? = type.cast(origin[index])
 }
 
-class ColumnProperty<C: Any, T : C>(val table: Table<C>, val type: KClass<T>) : ReadOnlyProperty<Any?, Column<T>> {
+public class ColumnProperty<C: Any, T : C>(public val table: Table<C>, public val type: KClass<T>) : ReadOnlyProperty<Any?, Column<T>> {
     override fun getValue(thisRef: Any?, property: KProperty<*>): Column<T> {
         val name = property.name
         return (table.columns[name] ?: error("Column with name $name not found in the table")).cast(type)
     }
 }
 
-operator fun <C: Any, T : C> Collection<Column<C>>.get(header: ColumnHeader<T>): Column<T>? =
+public operator fun <C: Any, T : C> Collection<Column<C>>.get(header: ColumnHeader<T>): Column<T>? =
     find { it.name == header.name }?.cast(header.type)