diff --git a/src/kiwano/base/ObjectBase.cpp b/src/kiwano/base/ObjectBase.cpp
index af095dd6..f0fc6729 100644
--- a/src/kiwano/base/ObjectBase.cpp
+++ b/src/kiwano/base/ObjectBase.cpp
@@ -57,12 +57,12 @@ namespace kiwano
 #endif
 	}
 
-	void * ObjectBase::GetUserData() const
+	const Any& ObjectBase::GetUserData() const
 	{
 		return user_data_;
 	}
 
-	void ObjectBase::SetUserData(void * data)
+	void ObjectBase::SetUserData(Any const& data)
 	{
 		user_data_ = data;
 	}
diff --git a/src/kiwano/base/ObjectBase.h b/src/kiwano/base/ObjectBase.h
index b3c5f0bc..fbf61547 100644
--- a/src/kiwano/base/ObjectBase.h
+++ b/src/kiwano/base/ObjectBase.h
@@ -36,13 +36,13 @@ namespace kiwano
 
 		virtual ~ObjectBase();
 
-		void* GetUserData() const;
+		const Any&		GetUserData() const;
 
-		void SetUserData(void* data);
+		void			SetUserData(Any const& data);
 
-		void SetName(String const& name);
+		void			SetName(String const& name);
 
-		String DumpObject();
+		String			DumpObject();
 
 		inline String	GetName() const						{ if (name_) return *name_; return String(); }
 
@@ -68,7 +68,7 @@ namespace kiwano
 
 	private:
 		bool	tracing_leak_;
-		void*	user_data_;
+		Any		user_data_;
 		String*	name_;
 
 		const uint32_t id_;
diff --git a/src/kiwano/core/any.hpp b/src/kiwano/core/any.hpp
index c8771e63..e01f86dc 100644
--- a/src/kiwano/core/any.hpp
+++ b/src/kiwano/core/any.hpp
@@ -36,7 +36,7 @@ public:
 
 	virtual const char* what() const override
 	{
-		return "bad and cast";
+		return "bad any_cast";
 	}
 };
 
@@ -60,12 +60,14 @@ public:
 
 	template <
 		typename _Ty,
-		typename _Decayed = typename std::decay<_Ty>::type,
 		typename... _Args
 	>
 	any(_Args&&... args) : storage_{}
 	{
-		emplace<_Decayed>(std::forward<_Args>(args)...);
+		using _Decayed = typename std::decay<_Ty>::type;
+
+		reset();
+		emplace_decayed<_Decayed>(std::forward<_Args>(args)...);
 	}
 
 	any(const any& rhs) : storage_{}
@@ -99,13 +101,15 @@ public:
 	}
 
 	template <
-		typename _Decayed,
+		typename _Ty,
 		typename... _Args
 	>
 	void emplace(_Args&&... args)
 	{
+		using _Decayed = typename std::decay<_Ty>::type;
+
 		reset();
-		store<_Decayed>(decayed_is_small<_Decayed>{}, std::forward<_Args>(args)...);
+		emplace_decayed<_Decayed>(std::forward<_Args>(args)...);
 	}
 
 	void swap(any& rhs) noexcept
@@ -196,6 +200,15 @@ protected:
 		return storage_.small_.info_;
 	}
 
+	template <
+		typename _Decayed,
+		typename... _Args
+	>
+	inline void emplace_decayed(_Args&&... args)
+	{
+		store<_Decayed>(decayed_is_small<_Decayed>{}, std::forward<_Args>(args)...);
+	}
+
 	template <
 		typename _Decayed,
 		typename... _Args
@@ -340,9 +353,9 @@ protected:
 		}
 
 		template <typename _Ty>
-		static void* copy_impl(void* const ptr) noexcept
+		static void* copy_impl(const void* const ptr) noexcept
 		{
-			return ::new _Ty(*static_cast<_Ty*>(ptr));
+			return ::new _Ty(*static_cast<const _Ty*>(ptr));
 		}
 
 		destroy_func* destroy;
@@ -468,7 +481,9 @@ const _Ty* any_cast(const any* const a) noexcept
 template <typename _Ty>
 _Ty any_cast(any& a)
 {
-	const auto ptr = any_cast<std::decay<_Ty>::type>(&a);
+	using _Decayed = typename std::decay<_Ty>::type;
+
+	const auto ptr = any_cast<_Decayed>(&a);
 	if (!ptr)
 	{
 		throw bad_any_cast{};
@@ -479,7 +494,9 @@ _Ty any_cast(any& a)
 template <typename _Ty>
 const _Ty any_cast(const any& a)
 {
-	const auto ptr = any_cast<std::decay<_Ty>::type>(&a);
+	using _Decayed = typename std::decay<_Ty>::type;
+
+	const auto ptr = any_cast<_Decayed>(&a);
 	if (!ptr)
 	{
 		throw bad_any_cast{};
@@ -490,7 +507,9 @@ const _Ty any_cast(const any& a)
 template <typename _Ty>
 _Ty any_cast(any&& a)
 {
-	_Ty* ptr = a.cast_pointer<_Ty>();
+	using _Decayed = typename std::decay<_Ty>::type;
+
+	const auto ptr = any_cast<_Decayed>(&a);
 	if (!ptr)
 	{
 		throw bad_any_cast{};
diff --git a/src/kiwano/core/core.h b/src/kiwano/core/core.h
index c32ba3f0..11a06e12 100644
--- a/src/kiwano/core/core.h
+++ b/src/kiwano/core/core.h
@@ -29,6 +29,7 @@
 
 #include <kiwano/core/vector.hpp>
 #include <kiwano/core/string.hpp>
+#include <kiwano/core/any.hpp>
 #include <kiwano/core/intrusive_list.hpp>
 #include <kiwano/core/intrusive_ptr.hpp>
 #include <kiwano/core/noncopyable.hpp>
@@ -69,6 +70,8 @@ namespace kiwano
 	template <typename _FuncTy>
 	using Function = kiwano::core::function<_FuncTy>;
 
+	using Any = kiwano::core::any;
+
 	using Json = kiwano::core::basic_json<kiwano::Map, kiwano::Vector, kiwano::String,
 		int, double, bool, std::allocator>;
 }
diff --git a/src/kiwano/kiwano.h b/src/kiwano/kiwano.h
index 11350c57..9db500d8 100644
--- a/src/kiwano/kiwano.h
+++ b/src/kiwano/kiwano.h
@@ -34,13 +34,14 @@
 
 #include <kiwano/core/vector.hpp>
 #include <kiwano/core/string.hpp>
-#include <kiwano/core/core.h>
-#include <kiwano/core/Function.hpp>
+#include <kiwano/core/any.hpp>
+#include <kiwano/core/function.hpp>
 #include <kiwano/core/intrusive_list.hpp>
 #include <kiwano/core/intrusive_ptr.hpp>
 #include <kiwano/core/noncopyable.hpp>
 #include <kiwano/core/singleton.hpp>
 #include <kiwano/core/basic_json.hpp>
+#include <kiwano/core/core.h>
 
 
 //