diff --git a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Meta.kt b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Meta.kt
index 45a27250..6b255a63 100644
--- a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Meta.kt
+++ b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Meta.kt
@@ -263,6 +263,4 @@ interface Metoid {
     val meta: Meta
 }
 
-fun Value.toMeta() = buildMeta { Meta.VALUE_KEY to this }
-
 fun Meta.isEmpty() = this === EmptyMeta || this.items.isEmpty()
diff --git a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/names/Name.kt b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/names/Name.kt
index 0531a818..41680eb0 100644
--- a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/names/Name.kt
+++ b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/names/Name.kt
@@ -139,7 +139,7 @@ fun String.toName(): Name {
  * Convert the [String] to a [Name] by simply wrapping it in a single name token without parsing.
  * The input string could contain dots and braces, but they are just escaped, not parsed.
  */
-fun String.asName(): Name = if(isBlank()) EmptyName else NameToken(this).asName()
+fun String.asName(): Name = if (isBlank()) EmptyName else NameToken(this).asName()
 
 operator fun NameToken.plus(other: Name): Name = Name(listOf(this) + other.tokens)
 
@@ -147,6 +147,8 @@ operator fun Name.plus(other: Name): Name = Name(this.tokens + other.tokens)
 
 operator fun Name.plus(other: String): Name = this + other.toName()
 
+operator fun Name.plus(other: NameToken): Name = Name(tokens + other)
+
 fun Name.appendLeft(other: String): Name = NameToken(other) + this
 
 fun NameToken.asName() = Name(listOf(this))
diff --git a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/values/Value.kt b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/values/Value.kt
index cd68e040..2fce145f 100644
--- a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/values/Value.kt
+++ b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/values/Value.kt
@@ -45,6 +45,8 @@ interface Value {
 
     override fun equals(other: Any?): Boolean
 
+    override fun hashCode(): Int
+
     companion object {
         const val TYPE = "value"
 
@@ -86,14 +88,9 @@ object Null : Value {
     override fun toString(): String = value.toString()
 
     override fun equals(other: Any?): Boolean = other === Null
+    override fun hashCode(): Int = 0
 }
 
-/**
- * Check if value is null
- */
-fun Value.isNull(): Boolean = this == Null
-
-
 /**
  * Singleton true value
  */
@@ -106,7 +103,7 @@ object True : Value {
     override fun toString(): String = value.toString()
 
     override fun equals(other: Any?): Boolean = other === True
-
+    override fun hashCode(): Int = 1
 }
 
 /**
@@ -121,10 +118,9 @@ object False : Value {
     override fun toString(): String = True.value.toString()
 
     override fun equals(other: Any?): Boolean = other === False
+    override fun hashCode(): Int = -1
 }
 
-val Value.boolean get() = this == True || this.list.firstOrNull() == True || (type == ValueType.STRING && string.toBoolean())
-
 class NumberValue(override val number: Number) : Value {
     override val value: Any? get() = number
     override val type: ValueType get() = ValueType.NUMBER
@@ -183,18 +179,18 @@ class ListValue(override val list: List<Value>) : Value {
         }
     }
 
-    override val value: Any? get() = list
+    override val value: List<Value> get() = list
     override val type: ValueType get() = list.first().type
     override val number: Number get() = list.first().number
     override val string: String get() = list.first().string
 
-    override fun toString(): String = list.joinToString (prefix = "[", postfix = "]")
+    override fun toString(): String = list.joinToString(prefix = "[", postfix = "]")
 
     override fun equals(other: Any?): Boolean {
         if (this === other) return true
         if (other !is Value) return false
-        if( other is DoubleArrayValue){
-
+        if (other is DoubleArrayValue) {
+            return DoubleArray(list.size) { list[it].number.toDouble() }.contentEquals(other.value)
         }
         return list == other.list
     }
@@ -206,12 +202,6 @@ class ListValue(override val list: List<Value>) : Value {
 
 }
 
-/**
- * Check if value is list
- */
-fun Value.isList(): Boolean = this.list.size > 1
-
-
 fun Number.asValue(): Value = NumberValue(this)
 
 fun Boolean.asValue(): Value = if (this) True else False
@@ -220,15 +210,15 @@ fun String.asValue(): Value = StringValue(this)
 
 fun Iterable<Value>.asValue(): Value = ListValue(this.toList())
 
-fun IntArray.asValue(): Value = ListValue(map{NumberValue(it)})
+fun IntArray.asValue(): Value = ListValue(map { NumberValue(it) })
 
-fun LongArray.asValue(): Value = ListValue(map{NumberValue(it)})
+fun LongArray.asValue(): Value = ListValue(map { NumberValue(it) })
 
-fun ShortArray.asValue(): Value = ListValue(map{NumberValue(it)})
+fun ShortArray.asValue(): Value = ListValue(map { NumberValue(it) })
 
-fun FloatArray.asValue(): Value = ListValue(map{NumberValue(it)})
+fun FloatArray.asValue(): Value = ListValue(map { NumberValue(it) })
 
-fun ByteArray.asValue(): Value = ListValue(map{NumberValue(it)})
+fun ByteArray.asValue(): Value = ListValue(map { NumberValue(it) })
 
 
 /**
diff --git a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/values/valueEstensions.kt b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/values/valueEstensions.kt
new file mode 100644
index 00000000..41a5bda3
--- /dev/null
+++ b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/values/valueEstensions.kt
@@ -0,0 +1,37 @@
+package hep.dataforge.values
+
+import hep.dataforge.meta.Meta
+import hep.dataforge.meta.buildMeta
+
+/**
+ * Check if value is null
+ */
+fun Value.isNull(): Boolean = this == Null
+
+/**
+ * Check if value is list
+ */
+fun Value.isList(): Boolean = this.list.size > 1
+
+val Value.boolean
+    get() = this == True
+            || this.list.firstOrNull() == True
+            || (type == ValueType.STRING && string.toBoolean())
+
+
+val Value.int get() = number.toInt()
+val Value.double get() = number.toDouble()
+val Value.float get() = number.toFloat()
+val Value.long get() = number.toLong()
+
+val Value.stringList: List<String> get() = list.map { it.string }
+
+val Value.doubleArray: DoubleArray
+    get() = if (this is DoubleArrayValue) {
+        value
+    } else {
+        DoubleArray(list.size) { list[it].double }
+    }
+
+
+fun Value.toMeta() = buildMeta { Meta.VALUE_KEY to this }
\ No newline at end of file