diff --git a/docs/modules/collections.md b/docs/modules/collections.md
index ea75dd3c..8273804a 100644
--- a/docs/modules/collections.md
+++ b/docs/modules/collections.md
@@ -14,5 +14,4 @@ A double-ended queue.
 
 ### `collections.defaultdict`
 
-A `dict` wrapper that calls a factory function to supply missing values.
-It is not a subclass of `dict`.
\ No newline at end of file
+A dictionary that returns a default value when a key is not found.
\ No newline at end of file
diff --git a/docs/retype.yml b/docs/retype.yml
index 215dff05..334974c0 100644
--- a/docs/retype.yml
+++ b/docs/retype.yml
@@ -3,7 +3,7 @@ output: .retype
 url: https://pocketpy.dev
 branding:
   title: pocketpy
-  label: v1.4.3
+  label: v1.4.4
   logo: "./static/logo.png"
 favicon: "./static/logo.png"
 meta:
diff --git a/include/pocketpy/_generated.h b/include/pocketpy/_generated.h
index f0968997..9b418776 100644
--- a/include/pocketpy/_generated.h
+++ b/include/pocketpy/_generated.h
@@ -7,7 +7,7 @@ namespace pkpy{
     inline const char kPythonLibs_bisect[] = {34,34,34,66,105,115,101,99,116,105,111,110,32,97,108,103,111,114,105,116,104,109,115,46,34,34,34,10,10,100,101,102,32,105,110,115,111,114,116,95,114,105,103,104,116,40,97,44,32,120,44,32,108,111,61,48,44,32,104,105,61,78,111,110,101,41,58,10,32,32,32,32,34,34,34,73,110,115,101,114,116,32,105,116,101,109,32,120,32,105,110,32,108,105,115,116,32,97,44,32,97,110,100,32,107,101,101,112,32,105,116,32,115,111,114,116,101,100,32,97,115,115,117,109,105,110,103,32,97,32,105,115,32,115,111,114,116,101,100,46,10,10,32,32,32,32,73,102,32,120,32,105,115,32,97,108,114,101,97,100,121,32,105,110,32,97,44,32,105,110,115,101,114,116,32,105,116,32,116,111,32,116,104,101,32,114,105,103,104,116,32,111,102,32,116,104,101,32,114,105,103,104,116,109,111,115,116,32,120,46,10,10,32,32,32,32,79,112,116,105,111,110,97,108,32,97,114,103,115,32,108,111,32,40,100,101,102,97,117,108,116,32,48,41,32,97,110,100,32,104,105,32,40,100,101,102,97,117,108,116,32,108,101,110,40,97,41,41,32,98,111,117,110,100,32,116,104,101,10,32,32,32,32,115,108,105,99,101,32,111,102,32,97,32,116,111,32,98,101,32,115,101,97,114,99,104,101,100,46,10,32,32,32,32,34,34,34,10,10,32,32,32,32,108,111,32,61,32,98,105,115,101,99,116,95,114,105,103,104,116,40,97,44,32,120,44,32,108,111,44,32,104,105,41,10,32,32,32,32,97,46,105,110,115,101,114,116,40,108,111,44,32,120,41,10,10,100,101,102,32,98,105,115,101,99,116,95,114,105,103,104,116,40,97,44,32,120,44,32,108,111,61,48,44,32,104,105,61,78,111,110,101,41,58,10,32,32,32,32,34,34,34,82,101,116,117,114,110,32,116,104,101,32,105,110,100,101,120,32,119,104,101,114,101,32,116,111,32,105,110,115,101,114,116,32,105,116,101,109,32,120,32,105,110,32,108,105,115,116,32,97,44,32,97,115,115,117,109,105,110,103,32,97,32,105,115,32,115,111,114,116,101,100,46,10,10,32,32,32,32,84,104,101,32,114,101,116,117,114,110,32,118,97,108,117,101,32,105,32,105,115,32,115,117,99,104,32,116,104,97,116,32,97,108,108,32,101,32,105,110,32,97,91,58,105,93,32,104,97,118,101,32,101,32,60,61,32,120,44,32,97,110,100,32,97,108,108,32,101,32,105,110,10,32,32,32,32,97,91,105,58,93,32,104,97,118,101,32,101,32,62,32,120,46,32,32,83,111,32,105,102,32,120,32,97,108,114,101,97,100,121,32,97,112,112,101,97,114,115,32,105,110,32,116,104,101,32,108,105,115,116,44,32,97,46,105,110,115,101,114,116,40,120,41,32,119,105,108,108,10,32,32,32,32,105,110,115,101,114,116,32,106,117,115,116,32,97,102,116,101,114,32,116,104,101,32,114,105,103,104,116,109,111,115,116,32,120,32,97,108,114,101,97,100,121,32,116,104,101,114,101,46,10,10,32,32,32,32,79,112,116,105,111,110,97,108,32,97,114,103,115,32,108,111,32,40,100,101,102,97,117,108,116,32,48,41,32,97,110,100,32,104,105,32,40,100,101,102,97,117,108,116,32,108,101,110,40,97,41,41,32,98,111,117,110,100,32,116,104,101,10,32,32,32,32,115,108,105,99,101,32,111,102,32,97,32,116,111,32,98,101,32,115,101,97,114,99,104,101,100,46,10,32,32,32,32,34,34,34,10,10,32,32,32,32,105,102,32,108,111,32,60,32,48,58,10,32,32,32,32,32,32,32,32,114,97,105,115,101,32,86,97,108,117,101,69,114,114,111,114,40,39,108,111,32,109,117,115,116,32,98,101,32,110,111,110,45,110,101,103,97,116,105,118,101,39,41,10,32,32,32,32,105,102,32,104,105,32,105,115,32,78,111,110,101,58,10,32,32,32,32,32,32,32,32,104,105,32,61,32,108,101,110,40,97,41,10,32,32,32,32,119,104,105,108,101,32,108,111,32,60,32,104,105,58,10,32,32,32,32,32,32,32,32,109,105,100,32,61,32,40,108,111,43,104,105,41,47,47,50,10,32,32,32,32,32,32,32,32,105,102,32,120,32,60,32,97,91,109,105,100,93,58,32,104,105,32,61,32,109,105,100,10,32,32,32,32,32,32,32,32,101,108,115,101,58,32,108,111,32,61,32,109,105,100,43,49,10,32,32,32,32,114,101,116,117,114,110,32,108,111,10,10,100,101,102,32,105,110,115,111,114,116,95,108,101,102,116,40,97,44,32,120,44,32,108,111,61,48,44,32,104,105,61,78,111,110,101,41,58,10,32,32,32,32,34,34,34,73,110,115,101,114,116,32,105,116,101,109,32,120,32,105,110,32,108,105,115,116,32,97,44,32,97,110,100,32,107,101,101,112,32,105,116,32,115,111,114,116,101,100,32,97,115,115,117,109,105,110,103,32,97,32,105,115,32,115,111,114,116,101,100,46,10,10,32,32,32,32,73,102,32,120,32,105,115,32,97,108,114,101,97,100,121,32,105,110,32,97,44,32,105,110,115,101,114,116,32,105,116,32,116,111,32,116,104,101,32,108,101,102,116,32,111,102,32,116,104,101,32,108,101,102,116,109,111,115,116,32,120,46,10,10,32,32,32,32,79,112,116,105,111,110,97,108,32,97,114,103,115,32,108,111,32,40,100,101,102,97,117,108,116,32,48,41,32,97,110,100,32,104,105,32,40,100,101,102,97,117,108,116,32,108,101,110,40,97,41,41,32,98,111,117,110,100,32,116,104,101,10,32,32,32,32,115,108,105,99,101,32,111,102,32,97,32,116,111,32,98,101,32,115,101,97,114,99,104,101,100,46,10,32,32,32,32,34,34,34,10,10,32,32,32,32,108,111,32,61,32,98,105,115,101,99,116,95,108,101,102,116,40,97,44,32,120,44,32,108,111,44,32,104,105,41,10,32,32,32,32,97,46,105,110,115,101,114,116,40,108,111,44,32,120,41,10,10,10,100,101,102,32,98,105,115,101,99,116,95,108,101,102,116,40,97,44,32,120,44,32,108,111,61,48,44,32,104,105,61,78,111,110,101,41,58,10,32,32,32,32,34,34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     inline const char kPythonLibs_builtins[] = 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     inline const char kPythonLibs_cmath[] = 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-    inline const char kPythonLibs_collections[] = {100,101,102,32,67,111,117,110,116,101,114,40,105,116,101,114,97,98,108,101,41,58,10,32,32,32,32,97,32,61,32,123,125,10,32,32,32,32,102,111,114,32,120,32,105,110,32,105,116,101,114,97,98,108,101,58,10,32,32,32,32,32,32,32,32,105,102,32,120,32,105,110,32,97,58,10,32,32,32,32,32,32,32,32,32,32,32,32,97,91,120,93,32,43,61,32,49,10,32,32,32,32,32,32,32,32,101,108,115,101,58,10,32,32,32,32,32,32,32,32,32,32,32,32,97,91,120,93,32,61,32,49,10,32,32,32,32,114,101,116,117,114,110,32,97,10,10,99,108,97,115,115,32,100,101,102,97,117,108,116,100,105,99,116,58,10,32,32,32,32,100,101,102,32,95,95,105,110,105,116,95,95,40,115,101,108,102,44,32,100,101,102,97,117,108,116,95,102,97,99,116,111,114,121,41,32,45,62,32,78,111,110,101,58,10,32,32,32,32,32,32,32,32,115,101,108,102,46,100,101,102,97,117,108,116,95,102,97,99,116,111,114,121,32,61,32,100,101,102,97,117,108,116,95,102,97,99,116,111,114,121,10,32,32,32,32,32,32,32,32,115,101,108,102,46,95,97,32,61,32,123,125,10,10,32,32,32,32,100,101,102,32,95,95,103,101,116,105,116,101,109,95,95,40,115,101,108,102,44,32,107,101,121,41,58,10,32,32,32,32,32,32,32,32,105,102,32,107,101,121,32,110,111,116,32,105,110,32,115,101,108,102,46,95,97,58,10,32,32,32,32,32,32,32,32,32,32,32,32,115,101,108,102,46,95,97,91,107,101,121,93,32,61,32,115,101,108,102,46,100,101,102,97,117,108,116,95,102,97,99,116,111,114,121,40,41,10,32,32,32,32,32,32,32,32,114,101,116,117,114,110,32,115,101,108,102,46,95,97,91,107,101,121,93,10,32,32,32,32,32,32,32,32,10,32,32,32,32,100,101,102,32,95,95,115,101,116,105,116,101,109,95,95,40,115,101,108,102,44,32,107,101,121,44,32,118,97,108,117,101,41,58,10,32,32,32,32,32,32,32,32,115,101,108,102,46,95,97,91,107,101,121,93,32,61,32,118,97,108,117,101,10,10,32,32,32,32,100,101,102,32,95,95,100,101,108,105,116,101,109,95,95,40,115,101,108,102,44,32,107,101,121,41,58,10,32,32,32,32,32,32,32,32,100,101,108,32,115,101,108,102,46,95,97,91,107,101,121,93,10,10,32,32,32,32,100,101,102,32,95,95,114,101,112,114,95,95,40,115,101,108,102,41,32,45,62,32,115,116,114,58,10,32,32,32,32,32,32,32,32,114,101,116,117,114,110,32,102,34,100,101,102,97,117,108,116,100,105,99,116,40,123,115,101,108,102,46,100,101,102,97,117,108,116,95,102,97,99,116,111,114,121,125,44,32,123,115,101,108,102,46,95,97,125,41,34,10,32,32,32,32,10,32,32,32,32,100,101,102,32,95,95,101,113,95,95,40,115,101,108,102,44,32,95,95,111,58,32,111,98,106,101,99,116,41,32,45,62,32,98,111,111,108,58,10,32,32,32,32,32,32,32,32,105,102,32,110,111,116,32,105,115,105,110,115,116,97,110,99,101,40,95,95,111,44,32,100,101,102,97,117,108,116,100,105,99,116,41,58,10,32,32,32,32,32,32,32,32,32,32,32,32,114,101,116,117,114,110,32,70,97,108,115,101,10,32,32,32,32,32,32,32,32,105,102,32,115,101,108,102,46,100,101,102,97,117,108,116,95,102,97,99,116,111,114,121,32,33,61,32,95,95,111,46,100,101,102,97,117,108,116,95,102,97,99,116,111,114,121,58,10,32,32,32,32,32,32,32,32,32,32,32,32,114,101,116,117,114,110,32,70,97,108,115,101,10,32,32,32,32,32,32,32,32,114,101,116,117,114,110,32,115,101,108,102,46,95,97,32,61,61,32,95,95,111,46,95,97,10,32,32,32,32,10,32,32,32,32,100,101,102,32,95,95,105,116,101,114,95,95,40,115,101,108,102,41,58,10,32,32,32,32,32,32,32,32,114,101,116,117,114,110,32,105,116,101,114,40,115,101,108,102,46,95,97,41,10,10,32,32,32,32,100,101,102,32,95,95,99,111,110,116,97,105,110,115,95,95,40,115,101,108,102,44,32,107,101,121,41,58,10,32,32,32,32,32,32,32,32,114,101,116,117,114,110,32,107,101,121,32,105,110,32,115,101,108,102,46,95,97,10,32,32,32,32,10,32,32,32,32,100,101,102,32,95,95,108,101,110,95,95,40,115,101,108,102,41,58,10,32,32,32,32,32,32,32,32,114,101,116,117,114,110,32,108,101,110,40,115,101,108,102,46,95,97,41,10,10,32,32,32,32,100,101,102,32,107,101,121,115,40,115,101,108,102,41,58,10,32,32,32,32,32,32,32,32,114,101,116,117,114,110,32,115,101,108,102,46,95,97,46,107,101,121,115,40,41,10,32,32,32,32,10,32,32,32,32,100,101,102,32,118,97,108,117,101,115,40,115,101,108,102,41,58,10,32,32,32,32,32,32,32,32,114,101,116,117,114,110,32,115,101,108,102,46,95,97,46,118,97,108,117,101,115,40,41,10,32,32,32,32,10,32,32,32,32,100,101,102,32,105,116,101,109,115,40,115,101,108,102,41,58,10,32,32,32,32,32,32,32,32,114,101,116,117,114,110,32,115,101,108,102,46,95,97,46,105,116,101,109,115,40,41,10,10,32,32,32,32,100,101,102,32,112,111,112,40,115,101,108,102,44,32,42,97,114,103,115,41,58,10,32,32,32,32,32,32,32,32,114,101,116,117,114,110,32,115,101,108,102,46,95,97,46,112,111,112,40,42,97,114,103,115,41,10,10,32,32,32,32,100,101,102,32,99,108,101,97,114,40,115,101,108,102,41,58,10,32,32,32,32,32,32,32,32,115,101,108,102,46,95,97,46,99,108,101,97,114,40,41,10,10,32,32,32,32,100,101,102,32,99,111,112,121,40,115,101,108,102,41,58,10,32,32,32,32,32,32,32,32,110,101,119,95,100,100,32,61,32,100,101,102,97,117,108,116,100,105,99,116,40,115,101,108,102,46,100,101,102,97,117,108,116,95,102,97,99,116,111,114,121,41,10,32,32,32,32,32,32,32,32,110,101,119,95,100,100,46,95,97,32,61,32,115,101,108,102,46,95,97,46,99,111,112,121,40,41,10,32,32,32,32,32,32,32,32,114,101,116,117,114,110,32,110,101,119,95,100,100,10,32,32,32,32,10,32,32,32,32,100,101,102,32,103,101,116,40,115,101,108,102,44,32,107,101,121,44,32,100,101,102,97,117,108,116,41,58,10,32,32,32,32,32,32,32,32,114,101,116,117,114,110,32,115,101,108,102,46,95,97,46,103,101,116,40,107,101,121,44,32,100,101,102,97,117,108,116,41,10,32,32,32,32,10,32,32,32,32,100,101,102,32,117,112,100,97,116,101,40,115,101,108,102,44,32,111,116,104,101,114,41,58,10,32,32,32,32,32,32,32,32,115,101,108,102,46,95,97,46,117,112,100,97,116,101,40,111,116,104,101,114,41,10,0};
+    inline const char kPythonLibs_collections[] = {100,101,102,32,67,111,117,110,116,101,114,40,105,116,101,114,97,98,108,101,41,58,10,32,32,32,32,97,32,61,32,123,125,10,32,32,32,32,102,111,114,32,120,32,105,110,32,105,116,101,114,97,98,108,101,58,10,32,32,32,32,32,32,32,32,105,102,32,120,32,105,110,32,97,58,10,32,32,32,32,32,32,32,32,32,32,32,32,97,91,120,93,32,43,61,32,49,10,32,32,32,32,32,32,32,32,101,108,115,101,58,10,32,32,32,32,32,32,32,32,32,32,32,32,97,91,120,93,32,61,32,49,10,32,32,32,32,114,101,116,117,114,110,32,97,10,10,99,108,97,115,115,32,100,101,102,97,117,108,116,100,105,99,116,40,100,105,99,116,41,58,10,32,32,32,32,100,101,102,32,95,95,105,110,105,116,95,95,40,115,101,108,102,44,32,100,101,102,97,117,108,116,95,102,97,99,116,111,114,121,44,32,42,97,114,103,115,41,58,10,32,32,32,32,32,32,32,32,115,117,112,101,114,40,41,46,95,95,105,110,105,116,95,95,40,42,97,114,103,115,41,10,32,32,32,32,32,32,32,32,115,101,108,102,46,95,101,110,97,98,108,101,95,105,110,115,116,97,110,99,101,95,100,105,99,116,40,41,10,32,32,32,32,32,32,32,32,115,101,108,102,46,100,101,102,97,117,108,116,95,102,97,99,116,111,114,121,32,61,32,100,101,102,97,117,108,116,95,102,97,99,116,111,114,121,10,10,32,32,32,32,100,101,102,32,95,95,109,105,115,115,105,110,103,95,95,40,115,101,108,102,44,32,107,101,121,41,58,10,32,32,32,32,32,32,32,32,115,101,108,102,91,107,101,121,93,32,61,32,115,101,108,102,46,100,101,102,97,117,108,116,95,102,97,99,116,111,114,121,40,41,10,32,32,32,32,32,32,32,32,114,101,116,117,114,110,32,115,101,108,102,91,107,101,121,93,10,10,32,32,32,32,100,101,102,32,95,95,114,101,112,114,95,95,40,115,101,108,102,41,32,45,62,32,115,116,114,58,10,32,32,32,32,32,32,32,32,114,101,116,117,114,110,32,102,34,100,101,102,97,117,108,116,100,105,99,116,40,123,115,101,108,102,46,100,101,102,97,117,108,116,95,102,97,99,116,111,114,121,125,44,32,123,115,117,112,101,114,40,41,46,95,95,114,101,112,114,95,95,40,41,125,41,34,10,10,32,32,32,32,100,101,102,32,99,111,112,121,40,115,101,108,102,41,58,10,32,32,32,32,32,32,32,32,114,101,116,117,114,110,32,100,101,102,97,117,108,116,100,105,99,116,40,115,101,108,102,46,100,101,102,97,117,108,116,95,102,97,99,116,111,114,121,44,32,115,101,108,102,41,10,10,0};
     inline const char kPythonLibs_colorsys[] = 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     inline const char kPythonLibs_datetime[] = 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     inline const char kPythonLibs_functools[] = {35,32,100,101,102,32,99,97,99,104,101,40,102,41,58,10,35,32,32,32,32,32,100,101,102,32,119,114,97,112,112,101,114,40,42,97,114,103,115,41,58,10,35,32,32,32,32,32,32,32,32,32,105,102,32,110,111,116,32,104,97,115,97,116,116,114,40,102,44,32,39,95,95,99,97,99,104,101,95,95,39,41,58,10,35,32,32,32,32,32,32,32,32,32,32,32,32,32,102,46,95,95,99,97,99,104,101,95,95,32,61,32,123,125,10,35,32,32,32,32,32,32,32,32,32,107,101,121,32,61,32,97,114,103,115,10,35,32,32,32,32,32,32,32,32,32,105,102,32,107,101,121,32,110,111,116,32,105,110,32,102,46,95,95,99,97,99,104,101,95,95,58,10,35,32,32,32,32,32,32,32,32,32,32,32,32,32,102,46,95,95,99,97,99,104,101,95,95,91,107,101,121,93,32,61,32,102,40,42,97,114,103,115,41,10,35,32,32,32,32,32,32,32,32,32,114,101,116,117,114,110,32,102,46,95,95,99,97,99,104,101,95,95,91,107,101,121,93,10,35,32,32,32,32,32,114,101,116,117,114,110,32,119,114,97,112,112,101,114,10,10,99,108,97,115,115,32,99,97,99,104,101,58,10,32,32,32,32,100,101,102,32,95,95,105,110,105,116,95,95,40,115,101,108,102,44,32,102,41,58,10,32,32,32,32,32,32,32,32,115,101,108,102,46,102,32,61,32,102,10,32,32,32,32,32,32,32,32,115,101,108,102,46,99,97,99,104,101,32,61,32,123,125,10,10,32,32,32,32,100,101,102,32,95,95,99,97,108,108,95,95,40,115,101,108,102,44,32,42,97,114,103,115,41,58,10,32,32,32,32,32,32,32,32,105,102,32,97,114,103,115,32,110,111,116,32,105,110,32,115,101,108,102,46,99,97,99,104,101,58,10,32,32,32,32,32,32,32,32,32,32,32,32,115,101,108,102,46,99,97,99,104,101,91,97,114,103,115,93,32,61,32,115,101,108,102,46,102,40,42,97,114,103,115,41,10,32,32,32,32,32,32,32,32,114,101,116,117,114,110,32,115,101,108,102,46,99,97,99,104,101,91,97,114,103,115,93,0};
diff --git a/include/pocketpy/common.h b/include/pocketpy/common.h
index 4bd2c098..c1ea3120 100644
--- a/include/pocketpy/common.h
+++ b/include/pocketpy/common.h
@@ -21,7 +21,7 @@
 #include <typeinfo>
 #include <initializer_list>
 
-#define PK_VERSION				"1.4.3"
+#define PK_VERSION				"1.4.4"
 
 #include "config.h"
 #include "export.h"
diff --git a/include/pocketpy/expr.h b/include/pocketpy/expr.h
index d030c2ad..b5df6f58 100644
--- a/include/pocketpy/expr.h
+++ b/include/pocketpy/expr.h
@@ -105,6 +105,7 @@ struct CodeEmitContext{
     void exit_block();
     void emit_expr();   // clear the expression stack and generate bytecode
     int emit_(Opcode opcode, uint16_t arg, int line, bool is_virtual=false);
+    void revert_last_emit_();
     int emit_int(i64 value, int line);
     void patch_jump(int index);
     bool add_label(StrName name);
@@ -113,6 +114,7 @@ struct CodeEmitContext{
     int add_const_string(std::string_view);
     int add_func_decl(FuncDecl_ decl);
     void emit_store_name(NameScope scope, StrName name, int line);
+    void try_merge_for_iter_store(int);
 };
 
 struct NameExpr: Expr{
diff --git a/include/pocketpy/opcodes.h b/include/pocketpy/opcodes.h
index bb98b568..269cf094 100644
--- a/include/pocketpy/opcodes.h
+++ b/include/pocketpy/opcodes.h
@@ -133,6 +133,9 @@ OPCODE(UNARY_INVERT)
 /**************************/
 OPCODE(GET_ITER)
 OPCODE(FOR_ITER)
+OPCODE(FOR_ITER_STORE_FAST)
+OPCODE(FOR_ITER_STORE_GLOBAL)
+OPCODE(FOR_ITER_YIELD_VALUE)
 /**************************/
 OPCODE(IMPORT_PATH)
 OPCODE(POP_IMPORT_STAR)
diff --git a/include/pocketpy/str.h b/include/pocketpy/str.h
index 5afa7e8e..3bcf7c95 100644
--- a/include/pocketpy/str.h
+++ b/include/pocketpy/str.h
@@ -224,6 +224,7 @@ const StrName __all__ = StrName::get("__all__");
 const StrName __package__ = StrName::get("__package__");
 const StrName __path__ = StrName::get("__path__");
 const StrName __class__ = StrName::get("__class__");
+const StrName __missing__ = StrName::get("__missing__");
 
 const StrName pk_id_add = StrName::get("add");
 const StrName pk_id_set = StrName::get("set");
diff --git a/include/pocketpy/vm.h b/include/pocketpy/vm.h
index 6aa0ad1f..4edbdb19 100644
--- a/include/pocketpy/vm.h
+++ b/include/pocketpy/vm.h
@@ -82,7 +82,6 @@ struct PyTypeInfo{
     void (*m__setattr__)(VM* vm, PyObject*, StrName, PyObject*) = nullptr;
     PyObject* (*m__getattr__)(VM* vm, PyObject*, StrName) = nullptr;
     bool (*m__delattr__)(VM* vm, PyObject*, StrName) = nullptr;
-
 };
 
 typedef void(*PrintFunc)(const char*, int);
diff --git a/python/collections.py b/python/collections.py
index 05fdd03d..7cf375ac 100644
--- a/python/collections.py
+++ b/python/collections.py
@@ -7,63 +7,19 @@ def Counter(iterable):
             a[x] = 1
     return a
 
-class defaultdict:
-    def __init__(self, default_factory) -> None:
+class defaultdict(dict):
+    def __init__(self, default_factory, *args):
+        super().__init__(*args)
+        self._enable_instance_dict()
         self.default_factory = default_factory
-        self._a = {}
 
-    def __getitem__(self, key):
-        if key not in self._a:
-            self._a[key] = self.default_factory()
-        return self._a[key]
-        
-    def __setitem__(self, key, value):
-        self._a[key] = value
-
-    def __delitem__(self, key):
-        del self._a[key]
+    def __missing__(self, key):
+        self[key] = self.default_factory()
+        return self[key]
 
     def __repr__(self) -> str:
-        return f"defaultdict({self.default_factory}, {self._a})"
-    
-    def __eq__(self, __o: object) -> bool:
-        if not isinstance(__o, defaultdict):
-            return False
-        if self.default_factory != __o.default_factory:
-            return False
-        return self._a == __o._a
-    
-    def __iter__(self):
-        return iter(self._a)
-
-    def __contains__(self, key):
-        return key in self._a
-    
-    def __len__(self):
-        return len(self._a)
-
-    def keys(self):
-        return self._a.keys()
-    
-    def values(self):
-        return self._a.values()
-    
-    def items(self):
-        return self._a.items()
-
-    def pop(self, *args):
-        return self._a.pop(*args)
-
-    def clear(self):
-        self._a.clear()
+        return f"defaultdict({self.default_factory}, {super().__repr__()})"
 
     def copy(self):
-        new_dd = defaultdict(self.default_factory)
-        new_dd._a = self._a.copy()
-        return new_dd
-    
-    def get(self, key, default):
-        return self._a.get(key, default)
-    
-    def update(self, other):
-        self._a.update(other)
+        return defaultdict(self.default_factory, self)
+
diff --git a/src/ceval.cpp b/src/ceval.cpp
index 5fb54671..e559f779 100644
--- a/src/ceval.cpp
+++ b/src/ceval.cpp
@@ -719,9 +719,34 @@ __NEXT_STEP:;
         if(_0 != StopIteration){
             PUSH(_0);
         }else{
-            frame->jump_abs_break(&s_data, byte.arg);
+            frame->jump_abs_break(&s_data, co->_get_block_codei(frame->_ip).end);
         }
     } DISPATCH();
+    TARGET(FOR_ITER_STORE_FAST){
+        PyObject* _0 = py_next(TOP());
+        if(_0 != StopIteration){
+            frame->_locals[byte.arg] = _0;
+        }else{
+            frame->jump_abs_break(&s_data, co->_get_block_codei(frame->_ip).end);
+        }
+    } DISPATCH()
+    TARGET(FOR_ITER_STORE_GLOBAL){
+        PyObject* _0 = py_next(TOP());
+        if(_0 != StopIteration){
+            frame->f_globals().set(StrName(byte.arg), _0);
+        }else{
+            frame->jump_abs_break(&s_data, co->_get_block_codei(frame->_ip).end);
+        }
+    } DISPATCH()
+    TARGET(FOR_ITER_YIELD_VALUE){
+        PyObject* _0 = py_next(TOP());
+        if(_0 != StopIteration){
+            PUSH(_0);
+            return PY_OP_YIELD;
+        }else{
+            frame->jump_abs_break(&s_data, co->_get_block_codei(frame->_ip).end);
+        }
+    } DISPATCH()
     /*****************************************/
     TARGET(IMPORT_PATH){
         PyObject* _0 = co->consts[byte.arg];
@@ -877,8 +902,16 @@ __NEXT_STEP:;
         *p = VAR(CAST(i64, *p) - 1);
     } DISPATCH();
     /*****************************************/
-        static_assert(OP_DEC_GLOBAL == 133);
-        case 134: case 135: case 136: case 137: case 138: case 139: case 140: case 141: case 142: case 143: case 144: case 145: case 146: case 147: case 148: case 149: case 150: case 151: case 152: case 153: case 154: case 155: case 156: case 157: case 158: case 159: case 160: case 161: case 162: case 163: case 164: case 165: case 166: case 167: case 168: case 169: case 170: case 171: case 172: case 173: case 174: case 175: case 176: case 177: case 178: case 179: case 180: case 181: case 182: case 183: case 184: case 185: case 186: case 187: case 188: case 189: case 190: case 191: case 192: case 193: case 194: case 195: case 196: case 197: case 198: case 199: case 200: case 201: case 202: case 203: case 204: case 205: case 206: case 207: case 208: case 209: case 210: case 211: case 212: case 213: case 214: case 215: case 216: case 217: case 218: case 219: case 220: case 221: case 222: case 223: case 224: case 225: case 226: case 227: case 228: case 229: case 230: case 231: case 232: case 233: case 234: case 235: case 236: case 237: case 238: case 239: case 240: case 241: case 242: case 243: case 244: case 245: case 246: case 247: case 248: case 249: case 250: case 251: case 252: case 253: case 254: case 255: PK_UNREACHABLE() break;
+        static_assert(OP_DEC_GLOBAL == 136);
+        case 137: case 138: case 139: case 140: case 141: case 142: case 143: case 144: case 145: case 146: case 147: case 148: case 149:
+        case 150: case 151: case 152: case 153: case 154: case 155: case 156: case 157: case 158: case 159: case 160: case 161: case 162: case 163: case 164:
+        case 165: case 166: case 167: case 168: case 169: case 170: case 171: case 172: case 173: case 174: case 175: case 176: case 177: case 178: case 179:
+        case 180: case 181: case 182: case 183: case 184: case 185: case 186: case 187: case 188: case 189: case 190: case 191: case 192: case 193: case 194:
+        case 195: case 196: case 197: case 198: case 199: case 200: case 201: case 202: case 203: case 204: case 205: case 206: case 207: case 208: case 209:
+        case 210: case 211: case 212: case 213: case 214: case 215: case 216: case 217: case 218: case 219: case 220: case 221: case 222: case 223: case 224:
+        case 225: case 226: case 227: case 228: case 229: case 230: case 231: case 232: case 233: case 234: case 235: case 236: case 237: case 238: case 239:
+        case 240: case 241: case 242: case 243: case 244: case 245: case 246: case 247: case 248: case 249: case 250: case 251: case 252: case 253: case 254:
+        case 255: break;
     }
 
 }
diff --git a/src/compiler.cpp b/src/compiler.cpp
index 1fff3aed..9b6bc251 100644
--- a/src/compiler.cpp
+++ b/src/compiler.cpp
@@ -50,15 +50,13 @@ namespace pkpy{
             // json mode does not contain jump instructions, so it is safe to ignore this check
             SyntaxError("maximum number of opcodes exceeded");
         }
-        // pre-compute LOOP_BREAK and LOOP_CONTINUE and FOR_ITER
+        // pre-compute LOOP_BREAK and LOOP_CONTINUE
         for(int i=0; i<codes.size(); i++){
             Bytecode& bc = codes[i];
             if(bc.op == OP_LOOP_CONTINUE){
                 bc.arg = ctx()->co->blocks[bc.arg].start;
             }else if(bc.op == OP_LOOP_BREAK){
                 bc.arg = ctx()->co->blocks[bc.arg].get_break_end();
-            }else if(bc.op == OP_FOR_ITER){
-                bc.arg = ctx()->co->_get_block_codei(i).end;
             }
         }
         // pre-compute func->is_simple
@@ -658,9 +656,10 @@ __EAT_DOTS_END:
         EXPR_TUPLE(); ctx()->emit_expr();
         ctx()->emit_(OP_GET_ITER, BC_NOARG, BC_KEEPLINE);
         CodeBlock* block = ctx()->enter_block(CodeBlockType::FOR_LOOP);
-        ctx()->emit_(OP_FOR_ITER, BC_NOARG, BC_KEEPLINE);
+        int for_codei = ctx()->emit_(OP_FOR_ITER, BC_NOARG, BC_KEEPLINE);
         bool ok = vars->emit_store(ctx());
         if(!ok) SyntaxError();  // this error occurs in `vars` instead of this line, but...nevermind
+        ctx()->try_merge_for_iter_store(for_codei);
         compile_block_body();
         ctx()->emit_(OP_LOOP_CONTINUE, ctx()->get_loop(), BC_KEEPLINE, true);
         ctx()->exit_block();
@@ -822,8 +821,7 @@ __EAT_DOTS_END:
                 ctx()->co->is_generator = true;
                 ctx()->emit_(OP_GET_ITER, BC_NOARG, kw_line);
                 ctx()->enter_block(CodeBlockType::FOR_LOOP);
-                ctx()->emit_(OP_FOR_ITER, BC_NOARG, kw_line);
-                ctx()->emit_(OP_YIELD_VALUE, BC_NOARG, kw_line);
+                ctx()->emit_(OP_FOR_ITER_YIELD_VALUE, BC_NOARG, kw_line);
                 ctx()->emit_(OP_LOOP_CONTINUE, ctx()->get_loop(), kw_line);
                 ctx()->exit_block();
                 consume_end_stmt();
diff --git a/src/expr.cpp b/src/expr.cpp
index 76d5981d..132cbcac 100644
--- a/src/expr.cpp
+++ b/src/expr.cpp
@@ -60,6 +60,31 @@ namespace pkpy{
         return i;
     }
 
+    void CodeEmitContext::revert_last_emit_(){
+        co->codes.pop_back();
+        co->iblocks.pop_back();
+        co->lines.pop_back();
+    }
+
+    void CodeEmitContext::try_merge_for_iter_store(int i){
+        // [FOR_ITER, STORE_?, ]
+        if(co->codes[i].op != OP_FOR_ITER) return;
+        if(co->codes.size() - i != 2) return;
+        uint16_t arg = co->codes[i+1].arg;
+        if(co->codes[i+1].op == OP_STORE_FAST){
+            revert_last_emit_();
+            co->codes[i].op = OP_FOR_ITER_STORE_FAST;
+            co->codes[i].arg = arg;
+            return;
+        }
+        if(co->codes[i+1].op == OP_STORE_GLOBAL){
+            revert_last_emit_();
+            co->codes[i].op = OP_FOR_ITER_STORE_GLOBAL;
+            co->codes[i].arg = arg;
+            return;
+        }
+    }
+
     int CodeEmitContext::emit_int(i64 value, int line){
         bool allow_neg_int = is_negative_shift_well_defined() || value >= 0;
         if(allow_neg_int && value >= -5 && value <= 16){
@@ -370,10 +395,11 @@ namespace pkpy{
         iter->emit_(ctx);
         ctx->emit_(OP_GET_ITER, BC_NOARG, BC_KEEPLINE);
         ctx->enter_block(CodeBlockType::FOR_LOOP);
-        ctx->emit_(OP_FOR_ITER, BC_NOARG, BC_KEEPLINE);
+        int for_codei = ctx->emit_(OP_FOR_ITER, BC_NOARG, BC_KEEPLINE);
         bool ok = vars->emit_store(ctx);
         // this error occurs in `vars` instead of this line, but...nevermind
         PK_ASSERT(ok);  // TODO: raise a SyntaxError instead
+        ctx->try_merge_for_iter_store(for_codei);
         if(cond){
             cond->emit_(ctx);
             int patch = ctx->emit_(OP_POP_JUMP_IF_FALSE, BC_NOARG, BC_KEEPLINE);
diff --git a/src/io.cpp b/src/io.cpp
index af77086e..d22650ff 100644
--- a/src/io.cpp
+++ b/src/io.cpp
@@ -77,7 +77,7 @@ void FileIO::_register(VM* vm, PyObject* mod, PyObject* type){
             buffer_size = size;
         }
         unsigned char* buffer = new unsigned char[buffer_size];
-        size_t actual_size = io_fread(buffer, 1, buffer_size, io.fp);
+        i64 actual_size = io_fread(buffer, 1, buffer_size, io.fp);
         PK_ASSERT(actual_size <= buffer_size);
         // in text mode, CR may be dropped, which may cause `actual_size < buffer_size`
         Bytes b(buffer, actual_size);
diff --git a/src/pocketpy.cpp b/src/pocketpy.cpp
index 1b407038..37284b63 100644
--- a/src/pocketpy.cpp
+++ b/src/pocketpy.cpp
@@ -399,31 +399,37 @@ void init_builtins(VM* _vm) {
         if(args.size() == 1+0) return VAR(0);
         // 1 arg
         if(args.size() == 1+1){
-            if (is_type(args[1], vm->tp_float)) return VAR((i64)CAST(f64, args[1]));
-            if (is_type(args[1], vm->tp_int)) return args[1];
-            if (is_type(args[1], vm->tp_bool)) return VAR(_CAST(bool, args[1]) ? 1 : 0);
+            switch(vm->_tp(args[1]).index){
+                case VM::tp_float.index:
+                    return VAR((i64)_CAST(f64, args[1]));
+                case VM::tp_int.index:
+                    return args[1];
+                case VM::tp_bool.index:
+                    return VAR(args[1]==vm->True ? 1 : 0);
+                case VM::tp_str.index:
+                    break;
+                default:
+                    vm->TypeError("invalid arguments for int()");
+            }
         }
+        // 2+ args -> error
         if(args.size() > 1+2) vm->TypeError("int() takes at most 2 arguments");
-        // 2 args
-        if (is_type(args[1], vm->tp_str)) {
-            int base = 10;
-            if(args.size() == 1+2) base = CAST(i64, args[2]);
-            const Str& s = CAST(Str&, args[1]);
-            std::string_view sv = s.sv();
-            bool negative = false;
-            if(!sv.empty() && (sv[0] == '+' || sv[0] == '-')){
-                negative = sv[0] == '-';
-                sv.remove_prefix(1);
-            }
-            i64 val;
-            if(parse_int(sv, &val, base) != IntParsingResult::Success){
-                vm->ValueError(_S("invalid literal for int() with base ", base, ": ", s.escape()));
-            }
-            if(negative) val = -val;
-            return VAR(val);
+        // 1 or 2 args with str
+        int base = 10;
+        if(args.size() == 1+2) base = CAST(i64, args[2]);
+        const Str& s = CAST(Str&, args[1]);
+        std::string_view sv = s.sv();
+        bool negative = false;
+        if(!sv.empty() && (sv[0] == '+' || sv[0] == '-')){
+            negative = sv[0] == '-';
+            sv.remove_prefix(1);
         }
-        vm->TypeError("invalid arguments for int()");
-        return vm->None;
+        i64 val;
+        if(parse_int(sv, &val, base) != IntParsingResult::Success){
+            vm->ValueError(_S("invalid literal for int() with base ", base, ": ", s.escape()));
+        }
+        if(negative) val = -val;
+        return VAR(val);
     });
 
     _vm->bind__floordiv__(VM::tp_int, [](VM* vm, PyObject* _0, PyObject* _1) {
@@ -438,6 +444,14 @@ void init_builtins(VM* _vm) {
         return VAR(_CAST(i64, _0) % rhs);
     });
 
+    _vm->bind_method<0>(VM::tp_int, "bit_length", [](VM* vm, ArgsView args) {
+        i64 x = _CAST(i64, args[0]);
+        if(x < 0) x = -x;
+        int bits = 0;
+        while(x){ x >>= 1; bits++; }
+        return VAR(bits);
+    });
+
     _vm->bind__repr__(VM::tp_int, [](VM* vm, PyObject* obj) { return VAR(std::to_string(_CAST(i64, obj))); });
     _vm->bind__neg__(VM::tp_int, [](VM* vm, PyObject* obj) { return VAR(-_CAST(i64, obj)); });
     _vm->bind__hash__(VM::tp_int, [](VM* vm, PyObject* obj) { return _CAST(i64, obj); });
@@ -460,26 +474,32 @@ void init_builtins(VM* _vm) {
         if(args.size() == 1+0) return VAR(0.0);
         if(args.size() > 1+1) vm->TypeError("float() takes at most 1 argument");
         // 1 arg
-        if (is_type(args[1], vm->tp_int)) return VAR((f64)CAST(i64, args[1]));
-        if (is_type(args[1], vm->tp_float)) return args[1];
-        if (is_type(args[1], vm->tp_bool)) return VAR(_CAST(bool, args[1]) ? 1.0 : 0.0);
-        if (is_type(args[1], vm->tp_str)) {
-            const Str& s = CAST(Str&, args[1]);
-            if(s == "inf") return VAR(INFINITY);
-            if(s == "-inf") return VAR(-INFINITY);
-
-            double float_out;
-            char* p_end;
-            try{
-                float_out = std::strtod(s.data, &p_end);
-                PK_ASSERT(p_end == s.end());
-            }catch(...){
-                vm->ValueError("invalid literal for float(): " + s.escape());
-            }
-            return VAR(float_out);
+        switch(vm->_tp(args[1]).index){
+            case VM::tp_int.index:
+                return VAR((f64)CAST(i64, args[1]));
+            case VM::tp_float.index:
+                return args[1];
+            case VM::tp_bool.index:
+                return VAR(args[1]==vm->True ? 1.0 : 0.0);
+            case VM::tp_str.index:
+                break;
+            default:
+                vm->TypeError("invalid arguments for float()");
         }
-        vm->TypeError("invalid arguments for float()");
-        return vm->None;
+        // str to float
+        const Str& s = PK_OBJ_GET(Str, args[1]);
+        if(s == "inf") return VAR(INFINITY);
+        if(s == "-inf") return VAR(-INFINITY);
+
+        double float_out;
+        char* p_end;
+        try{
+            float_out = std::strtod(s.data, &p_end);
+            PK_ASSERT(p_end == s.end());
+        }catch(...){
+            vm->ValueError("invalid literal for float(): " + s.escape());
+        }
+        return VAR(float_out);
     });
 
     _vm->bind__hash__(VM::tp_float, [](VM* vm, PyObject* _0) {
@@ -1216,37 +1236,53 @@ void init_builtins(VM* _vm) {
 
     // tp_dict
     _vm->bind_constructor<-1>(_vm->_t(VM::tp_dict), [](VM* vm, ArgsView args){
-        return VAR(Dict(vm));
+        Type cls_t = PK_OBJ_GET(Type, args[0]);
+        return vm->heap.gcnew<Dict>(cls_t, vm);
     });
 
     _vm->bind_method<-1>(VM::tp_dict, "__init__", [](VM* vm, ArgsView args){
         if(args.size() == 1+0) return vm->None;
         if(args.size() == 1+1){
             auto _lock = vm->heap.gc_scope_lock();
-            Dict& self = _CAST(Dict&, args[0]);
-            List& list = CAST(List&, args[1]);
-            for(PyObject* item : list){
-                Tuple& t = CAST(Tuple&, item);
-                if(t.size() != 2){
-                    vm->ValueError("dict() takes an iterable of tuples (key, value)");
-                    return vm->None;
+            Dict& self = PK_OBJ_GET(Dict, args[0]);
+            if(is_non_tagged_type(args[1], vm->tp_dict)){
+                Dict& other = CAST(Dict&, args[1]);
+                self.update(other);
+                return vm->None;
+            }
+            if(is_non_tagged_type(args[1], vm->tp_list)){
+                List& list = PK_OBJ_GET(List, args[1]);
+                for(PyObject* item : list){
+                    Tuple& t = CAST(Tuple&, item);
+                    if(t.size() != 2){
+                        vm->ValueError("dict() takes an iterable of tuples (key, value)");
+                        return vm->None;
+                    }
+                    self.set(t[0], t[1]);
                 }
-                self.set(t[0], t[1]);
             }
             return vm->None;
         }
         vm->TypeError("dict() takes at most 1 argument");
-        return vm->None;
+        PK_UNREACHABLE()
     });
 
     _vm->bind__len__(VM::tp_dict, [](VM* vm, PyObject* _0) {
-        return (i64)_CAST(Dict&, _0).size();
+        return (i64)PK_OBJ_GET(Dict, _0).size();
     });
 
     _vm->bind__getitem__(VM::tp_dict, [](VM* vm, PyObject* _0, PyObject* _1) {
-        Dict& self = _CAST(Dict&, _0);
+        Dict& self = PK_OBJ_GET(Dict, _0);
         PyObject* ret = self.try_get(_1);
-        if(ret == nullptr) vm->KeyError(_1);
+        if(ret == nullptr){
+            // try __missing__
+            PyObject* self;
+            PyObject* f_missing = vm->get_unbound_method(_0, __missing__, &self, false);
+            if(f_missing != nullptr){
+                return vm->call_method(self, f_missing, _1);
+            }
+            vm->KeyError(_1);
+        }
         return ret;
     });
 
@@ -1360,7 +1396,7 @@ void init_builtins(VM* _vm) {
 
     _vm->bind__eq__(VM::tp_dict, [](VM* vm, PyObject* _0, PyObject* _1) {
         Dict& self = _CAST(Dict&, _0);
-        if(!is_non_tagged_type(_1, vm->tp_dict)) return vm->NotImplemented;
+        if(!vm->isinstance(_1, vm->tp_dict)) return vm->NotImplemented;
         Dict& other = _CAST(Dict&, _1);
         if(self.size() != other.size()) return vm->False;
         for(int i=0; i<self._capacity; i++){
@@ -1597,4 +1633,4 @@ CodeObject_ VM::compile(std::string_view source, const Str& filename, CompileMod
     }
 }
 
-}   // namespace pkpy
\ No newline at end of file
+}   // namespace pkpy
diff --git a/src/vm.cpp b/src/vm.cpp
index 0c49a0b2..68b2e387 100644
--- a/src/vm.cpp
+++ b/src/vm.cpp
@@ -573,10 +573,10 @@ static std::string _opcode_argstr(VM* vm, Bytecode byte, const CodeObject* co){
         case OP_LOAD_NAME: case OP_LOAD_GLOBAL: case OP_LOAD_NONLOCAL: case OP_STORE_GLOBAL:
         case OP_LOAD_ATTR: case OP_LOAD_METHOD: case OP_STORE_ATTR: case OP_DELETE_ATTR:
         case OP_BEGIN_CLASS: case OP_GOTO:
-        case OP_DELETE_GLOBAL: case OP_INC_GLOBAL: case OP_DEC_GLOBAL: case OP_STORE_CLASS_ATTR:
+        case OP_DELETE_GLOBAL: case OP_INC_GLOBAL: case OP_DEC_GLOBAL: case OP_STORE_CLASS_ATTR: case OP_FOR_ITER_STORE_GLOBAL:
             argStr += _S(" (", StrName(byte.arg).sv(), ")").sv();
             break;
-        case OP_LOAD_FAST: case OP_STORE_FAST: case OP_DELETE_FAST: case OP_INC_FAST: case OP_DEC_FAST:
+        case OP_LOAD_FAST: case OP_STORE_FAST: case OP_DELETE_FAST: case OP_INC_FAST: case OP_DEC_FAST: case OP_FOR_ITER_STORE_FAST:
             argStr += _S(" (", co->varnames[byte.arg].sv(), ")").sv();
             break;
         case OP_LOAD_FUNCTION:
@@ -594,7 +594,7 @@ Str VM::disassemble(CodeObject_ co){
 
     pod_vector<int> jumpTargets;
     for(auto byte : co->codes){
-        if(byte.op == OP_JUMP_ABSOLUTE || byte.op == OP_POP_JUMP_IF_FALSE || byte.op == OP_SHORTCUT_IF_FALSE_OR_POP || byte.op == OP_FOR_ITER){
+        if(byte.op == OP_JUMP_ABSOLUTE || byte.op == OP_POP_JUMP_IF_FALSE || byte.op == OP_SHORTCUT_IF_FALSE_OR_POP){
             jumpTargets.push_back(byte.arg);
         }
         if(byte.op == OP_GOTO){
@@ -714,7 +714,7 @@ void VM::init_builtin_types(){
     if(tp_exception != _new_type_object("Exception", 0, true)) exit(-3);
     if(tp_bytes != _new_type_object("bytes")) exit(-3);
     if(tp_mappingproxy != _new_type_object("mappingproxy")) exit(-3);
-    if(tp_dict != _new_type_object("dict")) exit(-3);
+    if(tp_dict != _new_type_object("dict", 0, true)) exit(-3);  // dict can be subclassed
     if(tp_property != _new_type_object("property")) exit(-3);
     if(tp_star_wrapper != _new_type_object("_star_wrapper")) exit(-3);
 
@@ -1301,7 +1301,7 @@ void VM::bind__hash__(Type type, i64 (*f)(VM*, PyObject*)){
     PyObject* obj = _t(type);
     _all_types[type].m__hash__ = f;
     PyObject* nf = bind_method<0>(obj, "__hash__", [](VM* vm, ArgsView args){
-        i64 ret = lambda_get_userdata<i64(*)(VM*, PyObject*)>(args.begin())(vm, args[0]);
+        i64 ret = lambda_get_userdata<decltype(f)>(args.begin())(vm, args[0]);
         return VAR(ret);
     });
     PK_OBJ_GET(NativeFunc, nf).set_userdata(f);
@@ -1311,7 +1311,7 @@ void VM::bind__len__(Type type, i64 (*f)(VM*, PyObject*)){
     PyObject* obj = _t(type);
     _all_types[type].m__len__ = f;
     PyObject* nf = bind_method<0>(obj, "__len__", [](VM* vm, ArgsView args){
-        i64 ret = lambda_get_userdata<i64(*)(VM*, PyObject*)>(args.begin())(vm, args[0]);
+        i64 ret = lambda_get_userdata<decltype(f)>(args.begin())(vm, args[0]);
         return VAR(ret);
     });
     PK_OBJ_GET(NativeFunc, nf).set_userdata(f);
diff --git a/tests/01_int.py b/tests/01_int.py
index ce96102c..2c13964c 100644
--- a/tests/01_int.py
+++ b/tests/01_int.py
@@ -52,7 +52,23 @@ assert x == 3
 assert str(1) == '1'
 assert repr(1) == '1'
 
+# test bit_length
+assert (1).bit_length() == 1
+assert (2).bit_length() == 2
+assert (3).bit_length() == 2
+
+assert (-1).bit_length() == 1
+assert (-2).bit_length() == 2
+assert (-3).bit_length() == 2
+
+assert (123123123123123).bit_length() == 47
+assert (-3123123123).bit_length() == 32
+
 # test int()
+assert int() == 0
+assert int(True) == 1
+assert int(False) == 0
+
 assert int(1) == 1
 assert int(1.0) == 1
 assert int(1.1) == 1
diff --git a/tests/02_float.py b/tests/02_float.py
index 2b2587c3..07d972b8 100644
--- a/tests/02_float.py
+++ b/tests/02_float.py
@@ -36,6 +36,12 @@ assert str(1.0) == '1.0'
 assert repr(1.0) == '1.0'
 
 # test float()
+assert float() == 0.0
+assert float(True) == 1.0
+assert float(False) == 0.0
+assert float(1) == 1.0
+assert float(-2) == -2.0
+
 assert eq(float(1), 1.0)
 assert eq(float(1.0), 1.0)
 assert eq(float(1.1), 1.1)
diff --git a/tests/70_collections.py b/tests/70_collections.py
index c6c13262..e444c1ea 100644
--- a/tests/70_collections.py
+++ b/tests/70_collections.py
@@ -2,15 +2,15 @@ from collections import Counter, deque, defaultdict
 import random
 import pickle
 import gc
-import builtins
 
-dd_dict_keys = sorted(defaultdict.__dict__.keys())
-d_dict_keys = sorted(dict.__dict__.keys())
-d_dict_keys.remove('__new__')
-if dd_dict_keys != d_dict_keys:
-    print("dd_dict_keys:", dd_dict_keys)
-    print("d_dict_keys:", d_dict_keys)
-    raise Exception("dd_dict_keys != d_dict_keys")
+# test defaultdict
+assert issubclass(defaultdict, dict)
+a = defaultdict(int)
+a['1'] += 1
+assert a == {'1': 1}
+a = defaultdict(list)
+a['1'].append(1)
+assert a == {'1': [1]}
 
 q = deque()
 q.append(1)
diff --git a/tests/99_builtin_func.py b/tests/99_builtin_func.py
index fdda3383..afe89381 100644
--- a/tests/99_builtin_func.py
+++ b/tests/99_builtin_func.py
@@ -160,22 +160,6 @@ class A():
 
 repr(A())
 
-
-# 未完全测试准确性-----------------------------------------------
-#     33600:  318:    _vm->bind_constructor<-1>("range", [](VM* vm, ArgsView args) {
-#     16742:  319:        args._begin += 1;   // skip cls
-#     16742:  320:        Range r;
-#     16742:  321:        switch (args.size()) {
-#      8735:  322:            case 1: r.stop = CAST(i64, args[0]); break;
-#      3867:  323:            case 2: r.start = CAST(i64, args[0]); r.stop = CAST(i64, args[1]); break;
-#      4140:  324:            case 3: r.start = CAST(i64, args[0]); r.stop = CAST(i64, args[1]); r.step = CAST(i64, args[2]); break;
-#     #####:  325:            default: vm->TypeError("expected 1-3 arguments, got " + std::to_string(args.size()));
-#     #####:  326:        }
-#     33484:  327:        return VAR(r);
-#     16742:  328:    });
-#         -:  329:
-# test range:
-
 try:
     range(1,2,3,4)
     print('未能拦截错误, 在测试 range')