diff --git a/src/ldump.c b/src/ldump.c
index ad522aa..12c3693 100644
--- a/src/ldump.c
+++ b/src/ldump.c
@@ -157,6 +157,13 @@ static void DumpDebug (const Proto *f, DumpState *D) {
   DumpVector(f->lineinfo, n, D);
   /* n = (D->strip) ? 0 : f->sizelocvars; */
   n = f->sizelocvars;
+  if (D->strip) {
+    for (i = n - 1; i >= 0; i--) {
+      if (f->locvars[i].ravi_type_map != RAVI_TM_ANY)
+        break;
+    }
+    n = i + 1;
+  }
   DumpInt(n, D);
   for (i = 0; i < n; i++) {
     DumpString((D->strip) ? NULL : f->locvars[i].varname, D);
@@ -167,6 +174,13 @@ static void DumpDebug (const Proto *f, DumpState *D) {
   }
   /* n = (D->strip) ? 0 : f->sizeupvalues; */
   n = f->sizeupvalues;
+  if (D->strip) {
+    for (i = n - 1; i >= 0; i--) {
+      if (f->upvalues[i].ravi_type_map != RAVI_TM_ANY)
+        break;
+    }
+    n = i + 1;
+  }
   DumpInt(n, D);
   for (i = 0; i < n; i++) {
     DumpString((D->strip) ? NULL : f->upvalues[i].name, D);
diff --git a/src/lfunc.c b/src/lfunc.c
index 0864e19..927169c 100644
--- a/src/lfunc.c
+++ b/src/lfunc.c
@@ -249,10 +249,10 @@ const char *luaF_getlocalname (const Proto *f, int local_number, int pc, ravi_ty
     if (pc < f->locvars[i].endpc) {  /* is variable active? */
       local_number--;
       if (local_number == 0) {
-        if (f->locvars[i].varname == NULL)
-          break;
         *type = f->locvars[i].ravi_type_map;
         *usertype = f->locvars[i].usertype;
+        if (f->locvars[i].varname == NULL)
+          return NULL;
         return getstr(f->locvars[i].varname);
       }
     }
diff --git a/src/lundump.c b/src/lundump.c
index 9ecfc25..268cfa9 100644
--- a/src/lundump.c
+++ b/src/lundump.c
@@ -37,6 +37,7 @@ typedef struct {
   lua_State *L;
   ZIO *Z;
   const char *name;
+  lu_byte version;
 } LoadState;
 
 
@@ -174,6 +175,7 @@ static void LoadUpvalues (LoadState *S, Proto *f) {
   f->sizeupvalues = n;
   for (i = 0; i < n; i++) {
     f->upvalues[i].name = NULL;
+    f->upvalues[i].ravi_type_map = RAVI_TM_ANY;
     f->upvalues[i].usertype = NULL;
   }
   for (i = 0; i < n; i++) {
@@ -183,6 +185,23 @@ static void LoadUpvalues (LoadState *S, Proto *f) {
   }
 }
 
+static ravi_type_map ravi_map_old_type_to_new(lu_byte type) {
+  switch (type) {
+    case 0: return RAVI_TM_ANY;
+    case 1: return RAVI_TM_INTEGER;
+    case 2: return RAVI_TM_FLOAT;
+    case 3: return RAVI_TM_INTEGER_ARRAY;
+    case 4: return RAVI_TM_FLOAT_ARRAY;
+    case 5: return RAVI_TM_FUNCTION | RAVI_TM_NIL;
+    case 6: return RAVI_TM_TABLE;
+    case 7: return RAVI_TM_STRING | RAVI_TM_NIL;
+    case 8: return RAVI_TM_NIL;
+    case 9: return RAVI_TM_BOOLEAN | RAVI_TM_NIL;
+    case 10: return RAVI_TM_USERDATA | RAVI_TM_NIL;
+    default: return RAVI_TM_ANY;
+  }
+}
+
 static void LoadDebug (LoadState *S, Proto *f) {
   int i, n;
   n = LoadInt(S);
@@ -200,13 +219,13 @@ static void LoadDebug (LoadState *S, Proto *f) {
     f->locvars[i].varname = LoadString(S);
     f->locvars[i].startpc = LoadInt(S);
     f->locvars[i].endpc = LoadInt(S);
-    f->locvars[i].ravi_type_map = LoadInt(S);
+    f->locvars[i].ravi_type_map = S->version == 0 ? ravi_map_old_type_to_new(LoadByte(S)) : LoadInt(S);
     f->locvars[i].usertype = LoadString(S);
   }
   n = LoadInt(S);
   for (i = 0; i < n; i++) {
     f->upvalues[i].name = LoadString(S);
-    f->upvalues[i].ravi_type_map = LoadInt(S);
+    f->upvalues[i].ravi_type_map = S->version == 0 ? ravi_map_old_type_to_new(LoadByte(S)) : LoadInt(S);
     f->upvalues[i].usertype = LoadString(S);
   }
 }
@@ -250,7 +269,8 @@ static void checkHeader (LoadState *S) {
   checkliteral(S, LUA_SIGNATURE + 1, "not a");  /* 1st char already checked */
   if (LoadByte(S) != LUAC_VERSION)
     error(S, "version mismatch in");
-  if (LoadByte(S) != LUAC_FORMAT)
+  S->version = LoadByte(S);
+  if (S->version > LUAC_FORMAT)
     error(S, "format mismatch in");
   checkliteral(S, LUAC_DATA, "corrupted");
   checksize(S, int);
diff --git a/src/lundump.h b/src/lundump.h
index ce492d6..48dd0c7 100644
--- a/src/lundump.h
+++ b/src/lundump.h
@@ -20,7 +20,7 @@
 
 #define MYINT(s)	(s[0]-'0')
 #define LUAC_VERSION	(MYINT(LUA_VERSION_MAJOR)*16+MYINT(LUA_VERSION_MINOR))
-#define LUAC_FORMAT	0	/* this is the official format */
+#define LUAC_FORMAT	1	/* this is the official format */
 
 /* load one chunk; from lundump.c */
 LUAI_FUNC LClosure* luaU_undump (lua_State* L, ZIO* Z, const char* name);
diff --git a/src/ravi_jitshared.c b/src/ravi_jitshared.c
index 5751da6..91fe8ac 100644
--- a/src/ravi_jitshared.c
+++ b/src/ravi_jitshared.c
@@ -1214,8 +1214,8 @@ static void initfn(struct function *fn, struct lua_State *L, struct Proto *p, co
   fn->options = options;
   snprintf(fn->fname, sizeof fn->fname, "%s", fname);
   fn->jmps = calloc(p->sizecode, sizeof fn->jmps[0]);
-  if (p->sizelocvars)
-    fn->locals = calloc(p->sizelocvars, sizeof fn->locals[0]);
+  if (p->maxstacksize)
+    fn->locals = calloc(p->maxstacksize, sizeof fn->locals[0]);
   else
     fn->locals = NULL;
   membuff_init(&fn->prologue, strlen(Lua_header) + 4096);
diff --git a/tests/lua53/calls.lua b/tests/lua53/calls.lua
index 017d27c..1f6cdca 100644
--- a/tests/lua53/calls.lua
+++ b/tests/lua53/calls.lua
@@ -367,7 +367,7 @@ do
   local header = string.pack("c5BBc6BBBBBj",
     "\27Ravi",                -- signature
     5*16 + 3,                -- version 5.3
-    0,                       -- format
+    1,                       -- format
     "\x19\x93\r\n\x1a\n",    -- data
     string.packsize("i"),    -- sizeof(int)
     string.packsize("T"),    -- sizeof(size_t)