diff --git a/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/ioMisc.kt b/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/ioMisc.kt
index 4e4a7ff7..93fd210a 100644
--- a/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/ioMisc.kt
+++ b/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/ioMisc.kt
@@ -172,7 +172,7 @@ public fun Source.discardLine(
 /**
  * A [Source] based on [ByteArray]
  */
-public class ByteArraySource(
+internal class ByteArraySource(
     private val byteArray: ByteArray,
     private val offset: Int = 0,
     private val size: Int = byteArray.size - offset,
diff --git a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/SealedMeta.kt b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/SealedMeta.kt
index 05626368..1efec0f1 100644
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/SealedMeta.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/SealedMeta.kt
@@ -50,7 +50,7 @@ public fun Meta(value: Boolean): SealedMeta = Meta(value.asValue())
 
 
 /**
- * A lightweight mutable meta used to create [SealedMeta] instances without bothering with
+ * A lightweight mutable meta without an observability
  */
 @PublishedApi
 internal class MetaBuilder(
diff --git a/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/taskBuilders.kt b/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/taskBuilders.kt
index 09791d15..bf3d5921 100644
--- a/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/taskBuilders.kt
+++ b/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/taskBuilders.kt
@@ -33,9 +33,12 @@ public suspend inline fun <T : Any, reified P : WorkspacePlugin> TaskResultBuild
     dependencyMeta: Meta = defaultDependencyMeta,
     selectorBuilder: P.() -> TaskReference<T>,
 ): DataSet<T> {
-    require(workspace.context.plugins.contains(plugin)){"Plugin $plugin is not loaded into $workspace"}
+    require(workspace.context.plugins.contains(plugin)) { "Plugin $plugin is not loaded into $workspace" }
     val taskReference: TaskReference<T> = plugin.selectorBuilder()
-    return workspace.produce(plugin.name + taskReference.taskName, dependencyMeta) as TaskResult<T>
+    val res = workspace.produce(plugin.name + taskReference.taskName, dependencyMeta)
+    //TODO add explicit check after https://youtrack.jetbrains.com/issue/KT-32956
+    @Suppress("UNCHECKED_CAST")
+    return  res as TaskResult<T>
 }
 
 /**
@@ -45,7 +48,7 @@ public suspend inline fun <T : Any, reified P : WorkspacePlugin> TaskResultBuild
  * @param dependencyMeta meta used for selector. The same meta is used for caching. By default, uses [defaultDependencyMeta].
  * @param selectorBuilder a builder of task from the plugin.
  */
-public suspend inline fun <T : Any, reified P : WorkspacePlugin> TaskResultBuilder<*>.from(
+public suspend inline fun <reified T : Any, reified P : WorkspacePlugin> TaskResultBuilder<*>.from(
     pluginFactory: PluginFactory<P>,
     dependencyMeta: Meta = defaultDependencyMeta,
     selectorBuilder: P.() -> TaskReference<T>,
@@ -53,7 +56,10 @@ public suspend inline fun <T : Any, reified P : WorkspacePlugin> TaskResultBuild
     val plugin = workspace.context.plugins[pluginFactory]
         ?: error("Plugin ${pluginFactory.tag} not loaded into workspace context")
     val taskReference: TaskReference<T> = plugin.selectorBuilder()
-    return workspace.produce(plugin.name + taskReference.taskName, dependencyMeta) as TaskResult<T>
+    val res = workspace.produce(plugin.name + taskReference.taskName, dependencyMeta)
+    //TODO explicit check after https://youtrack.jetbrains.com/issue/KT-32956
+    @Suppress("UNCHECKED_CAST")
+    return res as TaskResult<T>
 }
 
 public val TaskResultBuilder<*>.allData: DataSelector<*>
@@ -79,7 +85,7 @@ public suspend inline fun <T : Any, reified R : Any> TaskResultBuilder<R>.pipeFr
 ) {
     from(selector, dependencyMeta).forEach { data ->
         val meta = data.meta.toMutableMeta().apply {
-            taskMeta[taskName]?.let {  taskName.put(it) }
+            taskMeta[taskName]?.let { taskName.put(it) }
             dataMetaTransform(data.name)
         }