diff --git a/cpp/Platform.Interfaces/IArray.h b/cpp/Platform.Interfaces/IArray.h
index d362f3c1..350cc201 100644
--- a/cpp/Platform.Interfaces/IArray.h
+++ b/cpp/Platform.Interfaces/IArray.h
@@ -5,16 +5,21 @@ namespace Platform::Interfaces
         template<typename Self, typename... Items>
         consteval bool IArrayHelpFunction()
         {
+            constexpr bool member_indexator = requires(Self self, std::size_t index)
+            {
+                { self[index] } -> std::same_as<typename Enumerable<Self>::ItemReference>;
+            };
+
             if constexpr (sizeof...(Items) == 1)
             {
                 using SelfItem = typename Enumerable<Self>::Item;
                 using RequiredItem = std::remove_reference_t<decltype(std::get<0>(std::declval<std::tuple<Items...>>()))>;
 
-                return std::ranges::random_access_range<Self> && std::same_as<SelfItem, RequiredItem>;
+                return member_indexator && std::ranges::random_access_range<Self> && std::same_as<SelfItem, RequiredItem>;
             }
             if constexpr (sizeof...(Items) == 0)
             {
-                return std::ranges::random_access_range<Self>;
+                return member_indexator &&  std::ranges::random_access_range<Self>;
             }
 
             return false;
diff --git a/cpp/Platform.Interfaces/IDictionary.h b/cpp/Platform.Interfaces/IDictionary.h
index 0f6ac841..fbf0730f 100644
--- a/cpp/Platform.Interfaces/IDictionary.h
+++ b/cpp/Platform.Interfaces/IDictionary.h
@@ -2,19 +2,24 @@ namespace Platform::Interfaces
 {
     namespace Internal
     {
-        template<typename Self, typename... Args>
+        template<typename RawSelf, typename... Args>
         consteval bool IDictionaryHelpFunction()
         {
+            using Self = std::remove_const_t<RawSelf>;
+
+            using GenericKey = std::remove_reference_t<decltype(std::get<0>(std::declval<typename Enumerable<Self>::Item>()))>;
+            using GenericValue = std::remove_reference_t<decltype(std::get<1>(std::declval<typename Enumerable<Self>::Item>()))>;
+
             if constexpr (sizeof...(Args) == 0)
             {
                 return requires
                 (
                     Self self,
-                    decltype(std::declval<Enumerable<Self>::Item>().first) generic_key,
-                    decltype(std::declval<Enumerable<Self>::Item>().second) generic_value
+                    GenericKey generic_key,
+                    GenericValue generic_value
                 )
                 {
-                    { self[generic_key] } -> std::same_as<typename Enumerable<Self>::ItemReference>;
+                    { self[generic_key] } -> std::same_as<GenericValue&>;
                     { self.find(generic_key) } -> std::forward_iterator;
                     { self.contains(generic_key) } -> std::same_as<bool>;
                     { self.insert({generic_key, generic_value}) };
@@ -36,7 +41,7 @@ namespace Platform::Interfaces
                     decltype(std::declval<Enumerable<Self>::Item>().second) generic_value
                 )
                 {
-                    { self[key] } -> std::same_as<typename Enumerable<Self>::ItemReference>;
+                    { self[key] } -> std::same_as<GenericValue&>;
                     { self.find(key) } -> std::forward_iterator;
                     { self.contains(key) } -> std::same_as<bool>;
                     { self.insert({key, generic_value}) };
@@ -58,7 +63,7 @@ namespace Platform::Interfaces
                     decltype(std::get<1>(args)) value
                 )
                 {
-                    { self[key] } -> std::same_as<typename Enumerable<Self>::ItemReference>;
+                    { self[key] } -> std::same_as<GenericValue&>;
                     { self.find(key) } -> std::forward_iterator;
                     { self.contains(key) } -> std::same_as<bool>;
                     { self.insert({key, value}) };
diff --git a/cpp/Platform.Interfaces/IList.h b/cpp/Platform.Interfaces/IList.h
index 02155e56..395f1dae 100644
--- a/cpp/Platform.Interfaces/IList.h
+++ b/cpp/Platform.Interfaces/IList.h
@@ -2,9 +2,11 @@ namespace Platform::Interfaces
 {
     namespace Internal
     {
-        template<typename Self, typename... Item>
+        template<typename RawSelf, typename... Item>
         consteval bool IListHelpFunction()
         {
+            using Self = std::remove_const_t<RawSelf>;
+
             if constexpr (sizeof...(Item) == 1)
             {
                 return requires
@@ -16,7 +18,6 @@ namespace Platform::Interfaces
                     std::ranges::iterator_t<const Self> const_iterator
                 )
                 {
-                    { self[index] } -> std::same_as<typename Enumerable<Self>::ItemReference>;
                     { self.push_back(item) };
                     { self.insert(const_iterator, item) };
                     { self.erase(const_iterator) };
@@ -34,7 +35,6 @@ namespace Platform::Interfaces
                     typename Enumerable<const Self>::Iter const_iterator
                 )
                 {
-                    { self[index] } -> std::same_as<typename Enumerable<Self>::ItemReference>;
                     { self.push_back(generic_item) };
                     { self.insert(const_iterator, generic_item) };
                     { self.erase(const_iterator) };
diff --git a/cpp/Platform.Interfaces/ISet.h b/cpp/Platform.Interfaces/ISet.h
index f93cae53..7b960909 100644
--- a/cpp/Platform.Interfaces/ISet.h
+++ b/cpp/Platform.Interfaces/ISet.h
@@ -2,9 +2,11 @@ namespace Platform::Interfaces
 {
     namespace Internal
     {
-        template<typename Self, typename... Items>
+        template<typename RawSelf, typename... Items>
         consteval bool ISetHelpFunction()
         {
+            using Self = std::remove_const_t<RawSelf>;
+
             if constexpr (sizeof...(Items) == 1)
             {
                 return requires
diff --git a/cpp/Platform.Interfaces/Platform.Interfaces.TemplateLibrary.nuspec b/cpp/Platform.Interfaces/Platform.Interfaces.TemplateLibrary.nuspec
index bdc87066..9aee50b4 100644
--- a/cpp/Platform.Interfaces/Platform.Interfaces.TemplateLibrary.nuspec
+++ b/cpp/Platform.Interfaces/Platform.Interfaces.TemplateLibrary.nuspec
@@ -6,13 +6,12 @@
     <summary>LinksPlatform's Platform.Interfaces is a Template Library what contains common concepts templates.</summary>
     <description>LinksPlatform's Platform.Interfaces is a Template Library what contains set of C++ concepts templates. Use Platform.Interfaces.h file to include the library.</description>
     <releaseNotes>
-        Fixed compile-error bug => (concepts without Item type tried get first type from Items... set)
-        Added more concepts:
-        - Added IDictionary concept (std::map and other dictionary types)
-        - Added ISet concept (std::set and other set types)
-        Moved concepts logic to Internal ConceptHelpFunction
+Bug fixes: 
+ - IAray now has operator[]
+ - IDictionary fix operator[]
+ - readonly collections are still equal to the usual ones     
     </releaseNotes>
-    <version>0.1.2</version>
+    <version>0.1.3</version>
     <authors>Konstantin Diachenko</authors>
     <owners>Konstantin Diachenko</owners>
     <copyright>Konstantin Diachenko</copyright>
diff --git a/cpp/Platform.Interfaces/Platform.Interfaces.h b/cpp/Platform.Interfaces/Platform.Interfaces.h
index 2862a322..1d342fc0 100644
--- a/cpp/Platform.Interfaces/Platform.Interfaces.h
+++ b/cpp/Platform.Interfaces/Platform.Interfaces.h
@@ -4,6 +4,7 @@
 #define PLATFORM_INTERFACES
 
 #include <concepts>
+#include <ranges>
 
 #include "IEnumerable.h"
 #include "IArray.h"