move the extra data to the start

CMakeLists.txt

@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.5)
 include(cmake/color.cmake)
 
-set(BLT_VERSION 0.14.2)
+set(BLT_VERSION 0.14.3)
 set(BLT_TEST_VERSION 0.0.1)
 
 set(BLT_TARGET BLT)

include/blt/std/array.h

@@ -45,9 +45,9 @@ namespace blt
     template<typename Extra>
     struct metadata_template_t
     {
+        Extra extra;
         // size in number of elements!
         blt::size_t size;
-        Extra extra;
         
         explicit metadata_template_t(blt::size_t size): size(size)
         {}