move sub-functions of value impls to concrete types

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

src/values/value.hpp

@@ -8,6 +8,7 @@
 struct IkarusValue {
 public:
     using Data = boost::variant2::variant<struct IkarusToggleValue *, struct IkarusNumberValue *, struct IkarusTextValue *>;
+    constexpr auto SMALL_VEC_VALUE_SIZE = 8;
 
 public:
     explicit IkarusValue(Data data);