implement value.hpp

Signed-off-by: Folling <mail@folling.io>

src/values/number_value.hpp

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <boost/container/vector.hpp>
+#include <boost/variant2.hpp>
 
 #include <values/value.hpp>
 
@@ -20,5 +21,5 @@ public:
     ~IkarusNumberValue() override = default;
 
 public:
-    boost::container::vector<data_type> value{};
+    boost::variant2::variant<boost::variant2::monostate, boost::container::vector<data_type>> data{};
 };