Convert to midp apis

src/core/org/luaj/vm2/LuaTable.java

@@ -569,8 +569,10 @@ public class LuaTable extends LuaValue {
 			Varargs n = next(k);
 			if ( (k = n.arg1()).isnil() )
 				break;
-			l.add( k );
+			l.addElement( k );
 		}
-		return (LuaValue[]) l.toArray(new LuaValue[l.size()]);
+		LuaValue[] a = new LuaValue[l.size()];
+		l.copyInto(a);
+		return a;
 	}
 }

src/core/org/luaj/vm2/WeakTable.java

@@ -61,7 +61,7 @@ public class WeakTable extends LuaTable {
 		return super.getHashLength();
 	}
 	
-	protected WeakTable changemode(boolean weakkeys, boolean weakvalues) {
+	protected LuaTable changemode(boolean weakkeys, boolean weakvalues) {
 		this.weakkeys = weakkeys;
 		this.weakvalues = weakvalues;
 		return this;