maps unpack

src/main/java/carpet/script/value/AbstractListValue.java

@@ -1,12 +1,15 @@
 package carpet.script.value;
 
 import carpet.script.exception.InternalExpressionException;
+import com.google.common.collect.Lists;
 
 import java.util.Iterator;
+import java.util.List;
 
 public abstract class AbstractListValue extends Value implements Iterable<Value>
 {
     public abstract Iterator<Value> iterator();
+    public List<Value> unpack() { return Lists.newArrayList(iterator()); }
     public void fatality() { }
     public void append(Value v)
     {

src/main/java/carpet/script/value/ListValue.java

@@ -29,7 +29,7 @@ import static java.lang.Math.abs;
 
 public class ListValue extends AbstractListValue implements ContainerValueInterface
 {
-    protected List<Value> items;
+    protected final List<Value> items;
     @Override
     public String getString()
     {
@@ -99,9 +99,7 @@ public class ListValue extends AbstractListValue implements ContainerValueInterf
 
     public static ListValue wrap(List<Value> list)
     {
-        ListValue created = new ListValue();
-        created.items = list;
-        return created;
+        return new ListValue(list);
     }
     public static ListValue of(Value ... list)
     {
@@ -283,10 +281,14 @@ public class ListValue extends AbstractListValue implements ContainerValueInterf
 
     public Iterator<Value> iterator() { return new ArrayList<>(items).iterator(); } // should be thread safe
 
+    public List<Value> unpack()
+    {
+        return new ArrayList<>(items);
+    }
+
     public void extend(List<Value> subList)
     {
-        for (Value v: subList)
-            items.add(v);
+        items.addAll(subList);
     }
 
     /**

src/main/java/carpet/script/value/MapValue.java

@@ -48,6 +48,12 @@ public class MapValue extends AbstractListValue implements ContainerValueInterfa
         return new ArrayList<>(map.keySet()).iterator();
     }
 
+    @Override
+    public List<Value> unpack()
+    {
+        return map.entrySet().stream().map(e -> ListValue.of(e.getKey(), e.getValue())).collect(Collectors.toList());
+    }
+
     @Override
     public String getString()
     {