diff --git a/include/pocketpy/export.h b/include/pocketpy/export.h
index b7baee80..d60e9ca3 100644
--- a/include/pocketpy/export.h
+++ b/include/pocketpy/export.h
@@ -55,3 +55,9 @@
 #else
     #define PK_IS_DESKTOP_PLATFORM 0
 #endif
+
+#if defined(__GNUC__) || defined(__clang__)
+    #define PK_DEPRECATED [[deprecated]]
+#else
+    #define PK_DEPRECATED
+#endif
\ No newline at end of file
diff --git a/include/pocketpy/interpreter/typeinfo.h b/include/pocketpy/interpreter/typeinfo.h
index 6594c702..e2901fa2 100644
--- a/include/pocketpy/interpreter/typeinfo.h
+++ b/include/pocketpy/interpreter/typeinfo.h
@@ -36,7 +36,4 @@ void TypeList__dtor(TypeList* self);
 py_TypeInfo* TypeList__get(TypeList* self, py_Type index);
 py_TypeInfo* TypeList__emplace(TypeList* self);
 void TypeList__apply(TypeList* self, void (*f)(py_TypeInfo*, void*), void* ctx);
-py_TValue* TypeList__magic(py_TypeInfo* self, unsigned index);
-py_TValue* TypeList__magic_readonly(py_TypeInfo* self, unsigned index);
 
-#define TypeList__magic_common(ti, index) ((ti)->magic_0 + ((index)-PK_MAGIC_SLOTS_UNCOMMON_LENGTH))
diff --git a/include/pocketpy/objects/codeobject.h b/include/pocketpy/objects/codeobject.h
index 74800e5e..3cef66ad 100644
--- a/include/pocketpy/objects/codeobject.h
+++ b/include/pocketpy/objects/codeobject.h
@@ -96,7 +96,7 @@ void CodeObject__gc_mark(const CodeObject* self, c11_vector* p_stack);
 
 typedef struct FuncDeclKwArg {
     int index;        // index in co->varnames
-    uint16_t key;     // name of this argument
+    py_Name key;      // name of this argument
     py_TValue value;  // default value
 } FuncDeclKwArg;
 
diff --git a/include/pocketpy/objects/namedict.h b/include/pocketpy/objects/namedict.h
index 41311c80..1ce2a735 100644
--- a/include/pocketpy/objects/namedict.h
+++ b/include/pocketpy/objects/namedict.h
@@ -37,6 +37,7 @@ typedef struct NameDict {
 } NameDict;
 
 NameDict* NameDict__new(float load_factor);
+void NameDict__delete(NameDict* self);
 void NameDict__ctor(NameDict* self, float load_factor);
 void NameDict__dtor(NameDict* self);
 py_TValue* NameDict__try_get(NameDict* self, py_Name key);
diff --git a/include/pocketpy/pocketpy.h b/include/pocketpy/pocketpy.h
index a8eb86b6..f92f8146 100644
--- a/include/pocketpy/pocketpy.h
+++ b/include/pocketpy/pocketpy.h
@@ -242,8 +242,8 @@ PK_API py_GlobalRef py_name2ref(py_Name);
 PK_API py_Name py_namev(c11_sv);
 /// Convert a name to a `c11_sv`.
 PK_API c11_sv py_name2sv(py_Name);
-
-#define py_ismagicname(name) (name <= __missing__)
+/// Check if the name matches the two underscores pattern. e.g. `__init__`, `__str__`, etc.
+PK_API bool py_ismagicname(py_Name);
 
 /************* Meta Operations *************/
 
@@ -318,7 +318,7 @@ PK_API bool py_issubclass(py_Type derived, py_Type base);
 
 /// Get the magic method from the given type only.
 /// The returned reference is always valid. However, its value may be `nil`.
-PK_API py_GlobalRef py_tpgetmagic(py_Type type, py_Name name);
+PK_API PK_DEPRECATED py_GlobalRef py_tpgetmagic(py_Type type, py_Name name);
 /// Search the magic method from the given type to the base type.
 /// Return `NULL` if not found.
 PK_API py_GlobalRef py_tpfindmagic(py_Type, py_Name name);
@@ -438,8 +438,8 @@ PK_API void py_bindfunc(py_Ref obj, const char* name, py_CFunction f);
 /// @param setter setter function. Use `NULL` if not needed.
 PK_API void
     py_bindproperty(py_Type type, const char* name, py_CFunction getter, py_CFunction setter);
-
-#define py_bindmagic(type, __magic__, f) py_newnativefunc(py_tpgetmagic((type), __magic__), (f))
+/// Bind a magic method to type.
+PK_API void py_bindmagic(py_Type type, py_Name name, py_CFunction f);
 
 #define PY_CHECK_ARGC(n)                                                                           \
     if(argc != n) return TypeError("expected %d arguments, got %d", n, argc)
@@ -737,11 +737,11 @@ enum py_PredefinedType {
     tp_locals,
     tp_code,
     tp_dict,
-    tp_dict_iterator, // 1 slot
-    tp_property,      // 2 slots (getter + setter)
-    tp_star_wrapper,  // 1 slot + int level
-    tp_staticmethod,  // 1 slot
-    tp_classmethod,   // 1 slot
+    tp_dict_iterator,  // 1 slot
+    tp_property,       // 2 slots (getter + setter)
+    tp_star_wrapper,   // 1 slot + int level
+    tp_staticmethod,   // 1 slot
+    tp_classmethod,    // 1 slot
     tp_NoneType,
     tp_NotImplementedType,
     tp_ellipsis,
diff --git a/src/interpreter/heap.c b/src/interpreter/heap.c
index 37b1d2ff..e50aaceb 100644
--- a/src/interpreter/heap.c
+++ b/src/interpreter/heap.c
@@ -44,7 +44,8 @@ void ManagedHeap__collect_if_needed(ManagedHeap* self) {
     const int lower = PK_GC_MIN_THRESHOLD / 2;
     float free_ratio = (float)avg_freed / self->gc_threshold;
     int new_threshold = self->gc_threshold * (1 / free_ratio);
-    // printf("gc_threshold=%d, avg_freed=%d, new_threshold=%d\n", self->gc_threshold, avg_freed, new_threshold);
+    // printf("gc_threshold=%d, avg_freed=%d, new_threshold=%d\n", self->gc_threshold, avg_freed,
+    // new_threshold);
     self->gc_threshold = c11__min(c11__max(new_threshold, lower), upper);
 }
 
@@ -98,7 +99,9 @@ PyObject* ManagedHeap__gcnew(ManagedHeap* self, py_Type type, int slots, int uds
     if(slots >= 0) {
         memset(obj->flex, 0, slots * sizeof(py_TValue));
     } else {
-        NameDict__ctor((void*)obj->flex);
+        float load_factor = (type == tp_type || type == tp_module) ? PK_TYPE_ATTR_LOAD_FACTOR
+                                                                   : PK_INST_ATTR_LOAD_FACTOR;
+        NameDict__ctor((void*)obj->flex, load_factor);
     }
 
     self->gc_counter++;
diff --git a/src/interpreter/typeinfo.c b/src/interpreter/typeinfo.c
index 35178c6b..7d352ae6 100644
--- a/src/interpreter/typeinfo.c
+++ b/src/interpreter/typeinfo.c
@@ -12,7 +12,7 @@ void TypeList__ctor(TypeList* self) {
 void TypeList__dtor(TypeList* self) {
     for(py_Type t = 0; t < self->length; t++) {
         py_TypeInfo* info = TypeList__get(self, t);
-        if(info->magic_1) PK_FREE(info->magic_1);
+        (void)info;
     }
     for(int i = 0; i < PK_MAX_CHUNK_LENGTH; i++) {
         if(self->chunks[i]) PK_FREE(self->chunks[i]);
@@ -47,28 +47,5 @@ void TypeList__apply(TypeList* self, void (*f)(py_TypeInfo*, void*), void* ctx)
     }
 }
 
-py_TValue* TypeList__magic(py_TypeInfo* self, unsigned index) {
-    if(index > __xor__) {
-        // common magic slots
-        return TypeList__magic_common(self, index);
-    }
-    // uncommon magic slots
-    if(self->magic_1 == NULL) {
-        self->magic_1 = PK_MALLOC(sizeof(py_TValue) * PK_MAGIC_SLOTS_UNCOMMON_LENGTH);
-        memset(self->magic_1, 0, sizeof(py_TValue) * PK_MAGIC_SLOTS_UNCOMMON_LENGTH);
-    }
-    return self->magic_1 + index;
-}
-
-py_TValue* TypeList__magic_readonly(py_TypeInfo* self, unsigned index) {
-    if(index > __xor__) {
-        // common magic slots
-        return TypeList__magic_common(self, index);
-    }
-    // uncommon magic slots
-    if(self->magic_1 == NULL) return py_NIL();
-    return self->magic_1 + index;
-}
-
 #undef CHUNK_SIZE
 #undef LOG2_CHUNK_SIZE
\ No newline at end of file
diff --git a/src/objects/namedict.c b/src/objects/namedict.c
index feb7afeb..d5f2cdbb 100644
--- a/src/objects/namedict.c
+++ b/src/objects/namedict.c
@@ -132,6 +132,11 @@ NameDict* NameDict__new(float load_factor) {
     return p;
 }
 
+void NameDict__delete(NameDict* self) {
+    NameDict__dtor(self);
+    PK_FREE(self);
+}
+
 void NameDict__ctor(NameDict* self, float load_factor) {
     assert(load_factor > 0.0f && load_factor < 1.0f);
     self->length = 0;
diff --git a/src/public/internal.c b/src/public/internal.c
index 7bbe124b..cd7c5945 100644
--- a/src/public/internal.c
+++ b/src/public/internal.c
@@ -229,14 +229,7 @@ bool pk_loadmethod(py_StackRef self, py_Name name) {
 
 py_Ref py_tpfindmagic(py_Type t, py_Name name) {
     assert(py_ismagicname(name));
-    py_TypeInfo* ti = pk__type_info(t);
-    do {
-        py_Ref f = TypeList__magic_readonly(ti, name);
-        assert(f != NULL);
-        if(!py_isnil(f)) return f;
-        ti = ti->base_ti;
-    } while(ti);
-    return NULL;
+    return py_tpfindname(t, name);
 }
 
 py_Ref py_tpfindname(py_Type t, py_Name name) {
@@ -249,10 +242,11 @@ py_Ref py_tpfindname(py_Type t, py_Name name) {
     return NULL;
 }
 
-py_Ref py_tpgetmagic(py_Type type, py_Name name) {
+PK_DEPRECATED py_Ref py_tpgetmagic(py_Type type, py_Name name) {
     assert(py_ismagicname(name));
     py_TypeInfo* ti = pk__type_info(type);
-    return TypeList__magic(ti, name);
+    py_Ref retval = py_getdict(&ti->self, name);
+    return retval != NULL ? retval : py_NIL();
 }
 
 py_Ref py_tpobject(py_Type type) {
diff --git a/src/public/py_ops.c b/src/public/py_ops.c
index 71d13bb7..2be4d16c 100644
--- a/src/public/py_ops.c
+++ b/src/public/py_ops.c
@@ -54,11 +54,10 @@ int py_bool(py_Ref val) {
 bool py_hash(py_Ref val, int64_t* out) {
     py_TypeInfo* ti = pk__type_info(val->type);
     do {
-        py_Ref slot_hash = TypeList__magic_common(ti, __hash__);
-        if(py_isnone(slot_hash)) break;
-        py_Ref slot_eq = TypeList__magic_common(ti, __eq__);
-        if(!py_isnil(slot_eq)) {
-            if(py_isnil(slot_hash)) break;
+        py_Ref slot_hash = py_getdict(&ti->self, __hash__);
+        if(!slot_hash || py_isnone(slot_hash)) break;
+        py_Ref slot_eq = py_getdict(&ti->self, __eq__);
+        if(slot_eq) {
             if(!py_call(slot_hash, 1, val)) return false;
             if(!py_checkint(py_retval())) return false;
             *out = py_toint(py_retval());
diff --git a/src/public/values.c b/src/public/values.c
index edb86f4e..a05abde6 100644
--- a/src/public/values.c
+++ b/src/public/values.c
@@ -83,14 +83,22 @@ void py_bindproperty(py_Type type, const char* name, py_CFunction getter, py_CFu
     py_setdict(py_tpobject(type), py_name(name), &tmp);
 }
 
+void py_bindmagic(py_Type type, py_Name name, py_CFunction f) {
+    py_Ref tmp = py_emplacedict(py_tpobject(type), name);
+    py_newnativefunc(tmp, f);
+}
+
 void py_bind(py_Ref obj, const char* sig, py_CFunction f) {
     py_TValue tmp;
     py_Name name = py_newfunction(&tmp, sig, f, NULL, 0);
     py_setdict(obj, name, &tmp);
 }
 
-py_Name
-    py_newfunction(py_OutRef out, const char* sig, py_CFunction f, const char* docstring, int slots) {
+py_Name py_newfunction(py_OutRef out,
+                       const char* sig,
+                       py_CFunction f,
+                       const char* docstring,
+                       int slots) {
     char buffer[256];
     snprintf(buffer, sizeof(buffer), "def %s: pass", sig);
     // fn(a, b, *c, d=1) -> None