diff --git a/config b/config
index 9ed3ba2..9236e7d 100644
--- a/config
+++ b/config
@@ -7,7 +7,7 @@ export PYTHONDONTWRITEBYTECODE=1
 export REBUILD=${REBUILD:-false}
 export CI=${CI:-false}
 
-export PYBUILD=${PYBUILD:-3.11}
+export PYBUILD=${PYBUILD:-3.12}
 export PYMAJOR=$(echo -n $PYBUILD|cut -d. -f1)
 export PYMINOR=$(echo -n $PYBUILD|cut -d. -f2)
 
@@ -42,11 +42,12 @@ fi
 
 
 #stable
-# EMFLAVOUR=latest
-# EMFLAVOUR=${EMFLAVOUR:-latest}
 # embind broke after 3.1.34
+# export EMFLAVOUR=${EMFLAVOUR:-3.1.34}
+# export EMFLAVOUR=${EMFLAVOUR:latest}
 
-export EMFLAVOUR=${EMFLAVOUR:-3.1.34}
+
+EMFLAVOUR=${EMFLAVOUR:-tot}
 
 # no extra wasm features
 export WASMFLAVOUR=mvp
diff --git a/scripts/cpython-build-emsdk-deps.sh b/scripts/cpython-build-emsdk-deps.sh
index dce7018..6ab505c 100755
--- a/scripts/cpython-build-emsdk-deps.sh
+++ b/scripts/cpython-build-emsdk-deps.sh
@@ -3,18 +3,20 @@
 . ${CONFIG:-config}
 
 
-
 for pkg in $ROOT/sources.wasm/*.sh
 do
-    pushd $ROOT/src
+    cd $ROOT
     chmod +x $pkg
+    echo "
+
+    Third party : $pkg
+
+
+"
     $pkg
-    popd
 done
 
 
-cd $ROOT/src
-
 cd $ROOT
 
 . ./scripts/emsdk-fetch.sh
diff --git a/scripts/cpython-build-emsdk-prebuilt.sh b/scripts/cpython-build-emsdk-prebuilt.sh
index 84d7d25..c4a86d6 100755
--- a/scripts/cpython-build-emsdk-prebuilt.sh
+++ b/scripts/cpython-build-emsdk-prebuilt.sh
@@ -22,6 +22,7 @@ echo "
 
 $PIP install --upgrade pip
 
+$PIP install --upgrade build
 
 # make wheels
 # /opt/python-wasm-sdk/python3-wasm setup.py bdist_wheel
diff --git a/scripts/cpython-build-emsdk.sh b/scripts/cpython-build-emsdk.sh
index 3459561..1d83e3a 100755
--- a/scripts/cpython-build-emsdk.sh
+++ b/scripts/cpython-build-emsdk.sh
@@ -248,18 +248,17 @@ mkdir -p $PYTHONPYCACHEPREFIX/sysconfig
 
 
 # FIXME: seems CI cannot locate that one with python3-wasm
-cp $PREFIX/lib/python${PYBUILD}/_sysconfigdata__emscripten_wasm32-emscripten.py \
- ${SDKROOT}/prebuilt/emsdk/${PYBUILD}/_sysconfigdata__emscripten_debug.py
 
-sed -i 's|-Os|-O0|g' ${SDKROOT}/prebuilt/emsdk/${PYBUILD}/_sysconfigdata__emscripten_debug.py
-sed -i 's|-g0|-g3|g' ${SDKROOT}/prebuilt/emsdk/${PYBUILD}/_sysconfigdata__emscripten_debug.py
+MODSYSCONFIG="${SDKROOT}/prebuilt/emsdk/${PYBUILD}/_sysconfigdata__emscripten_debug.py"
 
-#cp ${SDKROOT}/prebuilt/emsdk/${PYBUILD}/_sysconfigdata__emscripten_debug.py \
-# $PREFIX/lib/python${PYBUILD}/
+cp $PREFIX/lib/python${PYBUILD}/_sysconfigdata__emscripten_wasm32-emscripten.py \
+ ${MODSYSCONFIG}
 
-# python setup.py install --single-version-externally-managed --root=/
-# pip3 install .
+sed -i 's|-Os|-O0|g' ${MODSYSCONFIG}
+sed -i 's|-g0|-g3|g' ${MODSYSCONFIG}
 
+# this one is required for `python3-wasm -mbuild` venv
+ln ${MODSYSCONFIG} ${SDKROOT}/devices/$(arch)/usr/lib/python${PYBUILD}/
 
 # cmake usually wants cc
 ln ${SDKROOT}/emsdk/upstream/emscripten/emcc ${SDKROOT}/emsdk/upstream/emscripten/cc
diff --git a/sources.wasm/assimp.sh b/sources.wasm/assimp.sh
index 43a51aa..c0a7422 100755
--- a/sources.wasm/assimp.sh
+++ b/sources.wasm/assimp.sh
@@ -1,11 +1,13 @@
 #!/bin/bash
 
 
-
 . ${CONFIG:-config}
+. scripts/emsdk-fetch.sh
 
-export ASSIMP="assimpjs-wasm"
 
+cd ${ROOT}/src
+
+export ASSIMP="assimpjs-wasm"
 
 if [ -f assimp.patched ]
 then
@@ -38,4 +40,3 @@ else
     popd
 fi
 
-cd $SDKROOT
diff --git a/sources.wasm/ncurses.sh b/sources.wasm/ncurses.sh
index f99c1c0..96a5110 100644
--- a/sources.wasm/ncurses.sh
+++ b/sources.wasm/ncurses.sh
@@ -2,6 +2,11 @@
 
 . ${CONFIG:-config}
 
+. scripts/emsdk-fetch.sh
+
+
+cd ${ROOT}/src
+
 # --disable-database --enable-termcap
 
 NCOPTS="--enable-ext-colors --enable-ext-mouse --prefix=$PREFIX --disable-echo --without-pthread \
diff --git a/sources.wasm/openssl.sh b/sources.wasm/openssl.sh
index a62681e..5322565 100755
--- a/sources.wasm/openssl.sh
+++ b/sources.wasm/openssl.sh
@@ -1,12 +1,14 @@
 #!/bin/bash
 
 . ${CONFIG:-config}
+. scripts/emsdk-fetch.sh
 
+cd ${ROOT}/src
 export OPENSSL="openssl-1.1.1s"
 export URL_OPENSSL=${URL_OPENSSL:-"URL https://ftp.openssl.org/source/$OPENSSL.tar.gz"}
 export HASH_OPENSSL="URL_HASH SHA256=c5ac01e760ee6ff0dab61d6b2bbd30146724d063eb322180c6f18a6f74e4b6aa"
 
-. scripts/emsdk-fetch.sh
+
 
 if [ -f openssl.patched ]
 then
@@ -72,3 +74,4 @@ else
     cp libcrypto.a libssl.a "$PREFIX/lib"
     popd
 fi
+
diff --git a/support/__EMSCRIPTEN__.embed/browsermodule.c b/support/__EMSCRIPTEN__.embed/browsermodule.c
index 33bda7a..f3725a0 100644
--- a/support/__EMSCRIPTEN__.embed/browsermodule.c
+++ b/support/__EMSCRIPTEN__.embed/browsermodule.c
@@ -294,7 +294,7 @@ Object_await(Object *self) {
   wrapper->asyncio_future_blocking = 0;
 
   wrapper->result = (EM_VAL)EM_ASM_INT({
-    var value = emval_handle_array[$0].value;
+    var value = Emval.toValue($0);
     if (value && typeof value.then === "function") {
       value.then(function (result) {
         __py_notify_done($1, Emval.toHandle(result));
@@ -324,7 +324,7 @@ Object_await(Object *self) {
 static PyObject *
 Object_repr(Object *self) {
   char *str = (char *)EM_ASM_INT({
-    var value = emval_handle_array[$0].value;
+    var value = Emval.toValue($0);
     var str = value.constructor ? value.constructor.name : 'Object';
     var len = lengthBytesUTF8(str) + 1;
     var buffer = _malloc(len);
@@ -351,7 +351,7 @@ Object_hash(Object *self) {
 static PyObject *
 Object_str(Object *self) {
   char *str = (char *)EM_ASM_INT({
-    var str = emval_handle_array[$0].value.toString();
+    var str = Emval.toValue($0).toString();
     var len = lengthBytesUTF8(str) + 1;
     var buffer = _malloc(len);
     stringToUTF8(str, buffer, len);
@@ -369,7 +369,7 @@ Object_str(Object *self) {
 static Py_ssize_t
 Object_length(Object *self) {
   int len = EM_ASM_INT({
-    var val = emval_handle_array[$0].value;
+    var val = Emval.toValue($0);
     if (val[Symbol.iterator] && val.length !== undefined) {
       return val.length;
     }
@@ -399,7 +399,7 @@ Object_getprop(Object *self, PyObject *item) {
 
   EM_VAL result = (EM_VAL)EM_ASM_INT({
     try {
-      return Emval.toHandle(emval_handle_array[$0].value[emval_handle_array[$1].value]);
+      return Emval.toHandle(Emval.toValue($0)[Emval.toValue($1)]);
     }
     catch (ex) {
       return -Emval.toHandle(ex);
@@ -490,7 +490,7 @@ Object_richcompare(Object *self, PyObject *other, int op) {
 static PyObject *
 Object_iter(Object *self) {
   EM_VAL val = (EM_VAL)EM_ASM_INT({
-    var val = emval_handle_array[$0].value;
+    var val = Emval.toValue($0);
     if (val[Symbol.iterator]) {
       return Emval.toHandle(val[Symbol.iterator]());
     } else {
@@ -518,7 +518,7 @@ Object_iter(Object *self) {
 static PyObject *
 Object_next(Object *self) {
   EM_VAL val = (EM_VAL)EM_ASM_INT({
-    var val = emval_handle_array[$0].value;
+    var val = Emval.toValue($0);
     if (!val.next) {
       return 0;
     }
@@ -545,7 +545,7 @@ static PyObject *
 Object_dir(Object *self, PyObject *noarg) {
   return emval_to_py((EM_VAL)EM_ASM_INT({
     var props = [];
-    for (var prop in emval_handle_array[$0].value) {
+    for (var prop in Emval.toValue($0)) {
       props.push(prop);
     }
     return Emval.toHandle(props);
@@ -620,7 +620,7 @@ Function_call(Function *self, PyObject *args, PyObject *kwargs) {
   case 0:
     result = (EM_VAL)EM_ASM_INT({
       try {
-        return Emval.toHandle(emval_handle_array[$0].value.call(emval_handle_array[$1].value));
+        return Emval.toHandle(Emval.toValue($0).call(Emval.toValue($1)));
       }
       catch (ex) {
         return -Emval.toHandle(ex);
@@ -635,7 +635,7 @@ Function_call(Function *self, PyObject *args, PyObject *kwargs) {
       }
       result = (EM_VAL)EM_ASM_INT({
         try {
-          return Emval.toHandle(emval_handle_array[$0].value.call(emval_handle_array[$1].value, emval_handle_array[$2].value));
+          return Emval.toHandle(Emval.toValue($0).call(Emval.toValue($1), Emval.toValue($2)));
         }
         catch (ex) {
           return -Emval.toHandle(ex);
@@ -668,9 +668,9 @@ Function_call(Function *self, PyObject *args, PyObject *kwargs) {
           for (var i = 0; i < $2; ++i) {
             var arg_handle = getValue($3+i*4, 'i32');
             arg_handles.push(arg_handle);
-            arg_values.push(emval_handle_array[arg_handle].value);
+            arg_values.push(Emval.toValue(arg_handle));
           }
-          return Emval.toHandle(emval_handle_array[$0].value.apply(emval_handle_array[$1].value, arg_values));
+          return Emval.toHandle(Emval.toValue($0).apply(Emval.toValue($1), arg_values));
         }
         catch (ex) {
           return -Emval.toHandle(ex);
@@ -709,7 +709,7 @@ static PyTypeObject Function_Type = {
 static PyObject *
 Symbol_description(Symbol *self, void *unused) {
   char *str = (char *)EM_ASM_INT({
-    var str = emval_handle_array[$0].value.description;
+    var str = Emval.toValue($0).description;
     var len = lengthBytesUTF8(str) + 1;
     var buffer = _malloc(len);
     stringToUTF8(str, buffer, len);
@@ -896,7 +896,7 @@ static EM_VAL py_to_emval(PyObject *val) {
             setValue(argv+i*4, Emval.toHandle(arguments[i]), 'i32');
           }
           var result = __py_call($1, $2, Emval.toHandle(this), argc, argv);
-          return emval_handle_array[result].value;
+          return Emval.toValue(result);
         }
       });
     }, callback_id, func, self, max_args);
@@ -933,7 +933,7 @@ static PyObject *emval_to_py(EM_VAL handle) {
 
     // Extract the message and the exception type.
     int type = EM_ASM_INT({
-      var exc = emval_handle_array[$0].value;
+      var exc = Emval.toValue($0);
       try {
         if (exc.message) {
           stringToUTF8(exc.message, $1, 512);
@@ -978,7 +978,7 @@ static PyObject *emval_to_py(EM_VAL handle) {
   } target;
 
   int type = EM_ASM_INT(({
-    var value = emval_handle_array[$0].value;
+    var value = Emval.toValue($0);
     var type = typeof value;
     if (type === "number") {
       // Check whether it fits in an int.
@@ -1061,7 +1061,7 @@ browser_getattr(PyObject *self, PyObject *arg) {
   }
   EM_VAL result = (EM_VAL)EM_ASM_INT({
     try {
-      return Emval.toHandle(window[emval_handle_array[$0].value]);
+      return Emval.toHandle(window[Emval.toValue($0)]);
     }
     catch (ex) {
       return -Emval.toHandle(ex);