diff --git a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Delegates.kt b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Delegates.kt
index 119b78b0..8cb9250e 100644
--- a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Delegates.kt
+++ b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Delegates.kt
@@ -245,6 +245,7 @@ class MutableNumberDelegate<M : MutableMeta<M>>(
     }
 
     val double get() = ReadWriteDelegateWrapper(this, reader = { it?.toDouble() }, writer = { it })
+    val float get() = ReadWriteDelegateWrapper(this, reader = { it?.toFloat() }, writer = { it })
     val int get() = ReadWriteDelegateWrapper(this, reader = { it?.toInt() }, writer = { it })
     val short get() = ReadWriteDelegateWrapper(this, reader = { it?.toShort() }, writer = { it })
     val long get() = ReadWriteDelegateWrapper(this, reader = { it?.toLong() }, writer = { it })
@@ -303,6 +304,7 @@ class MutableSafeNumberDelegate<M : MutableMeta<M>>(
     }
 
     val double get() = ReadWriteDelegateWrapper(this, reader = { it.toDouble() }, writer = { it })
+    val float get() = ReadWriteDelegateWrapper(this, reader = { it.toFloat() }, writer = { it })
     val int get() = ReadWriteDelegateWrapper(this, reader = { it.toInt() }, writer = { it })
     val short get() = ReadWriteDelegateWrapper(this, reader = { it.toShort() }, writer = { it })
     val long get() = ReadWriteDelegateWrapper(this, reader = { it.toLong() }, writer = { it })
diff --git a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/MutableMeta.kt b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/MutableMeta.kt
index f3b4f3ba..e1a56832 100644
--- a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/MutableMeta.kt
+++ b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/MutableMeta.kt
@@ -118,6 +118,7 @@ operator fun <M : MutableMetaNode<M>> M.set(name: Name, value: Any?) {
             is MetaItem.NodeItem<*> -> setNode(name, value.node)
         }
         is Meta -> setNode(name, value)
+        is Specification -> setNode(name, value.config)
         else -> setValue(name, Value.of(value))
     }
 }
@@ -183,3 +184,5 @@ fun <M : MutableMetaNode<M>> M.append(name: Name, value: Any?) {
         set(name.withIndex(index.toString()), value)
     }
 }
+
+fun <M : MutableMetaNode<M>> M.append(name: String, value: Any?) = append(name.toName(), value)
\ No newline at end of file