diff --git a/Include/cpython/pylifecycle.h b/Include/cpython/pylifecycle.h
index e32e54c..0c5f74e 100644
--- a/Include/cpython/pylifecycle.h
+++ b/Include/cpython/pylifecycle.h
@@ -21,8 +21,8 @@
     const _PyCoreConfig *coreconfig);
 
 PyAPI_FUNC(_PyInitError) _Py_InitializeCore(
-    PyInterpreterState **interp,
-    const _PyCoreConfig *);
+    const _PyCoreConfig *config,
+    PyInterpreterState **interp);
 PyAPI_FUNC(int) _Py_IsCoreInitialized(void);
 
 
diff --git a/Include/internal/pycore_coreconfig.h b/Include/internal/pycore_coreconfig.h
index d79f590..dad5d3f 100644
--- a/Include/internal/pycore_coreconfig.h
+++ b/Include/internal/pycore_coreconfig.h
@@ -14,8 +14,8 @@
 typedef struct {
     _PyWstrList argv;
     _PyWstrList xoptions;     /* "-X value" option */
-    int use_environment;      /* -E option */
     int isolated;             /* -I option */
+    int use_environment;      /* -E option */
     int dev_mode;             /* -X dev and PYTHONDEVMODE */
 } _PyPreCmdline;
 
@@ -27,23 +27,14 @@
 /* Note: _PyPreCmdline_INIT sets other fields to 0/NULL */
 
 PyAPI_FUNC(void) _PyPreCmdline_Clear(_PyPreCmdline *cmdline);
-PyAPI_FUNC(int) _PyPreCmdline_Copy(_PyPreCmdline *cmdline,
-    const _PyPreCmdline *cmdline2);
 PyAPI_FUNC(_PyInitError) _PyPreCmdline_SetArgv(_PyPreCmdline *cmdline,
     const _PyArgv *args);
-PyAPI_FUNC(void) _PyPreCmdline_GetPreConfig(
-    _PyPreCmdline *cmdline,
-    const _PyPreConfig *config);
-PyAPI_FUNC(void) _PyPreCmdline_SetPreConfig(
-    const _PyPreCmdline *cmdline,
-    _PyPreConfig *config);
-PyAPI_FUNC(void) _PyPreCmdline_GetCoreConfig(
-    _PyPreCmdline *cmdline,
-    const _PyCoreConfig *config);
-PyAPI_FUNC(void) _PyPreCmdline_SetCoreConfig(
+PyAPI_FUNC(int) _PyPreCmdline_SetCoreConfig(
     const _PyPreCmdline *cmdline,
     _PyCoreConfig *config);
-PyAPI_FUNC(_PyInitError) _PyPreCmdline_Read(_PyPreCmdline *cmdline);
+PyAPI_FUNC(_PyInitError) _PyPreCmdline_Read(_PyPreCmdline *cmdline,
+    const _PyPreConfig *preconfig,
+    const _PyCoreConfig *coreconfig);
 
 
 /* --- _PyWstrList ------------------------------------------------ */
@@ -57,6 +48,8 @@
 PyAPI_FUNC(int) _PyWstrList_Append(_PyWstrList *list,
     const wchar_t *item);
 PyAPI_FUNC(PyObject*) _PyWstrList_AsList(const _PyWstrList *list);
+PyAPI_FUNC(int) _PyWstrList_Extend(_PyWstrList *list,
+    const _PyWstrList *list2);
 
 
 /* --- _PyArgv ---------------------------------------------------- */
@@ -70,7 +63,7 @@
 PyAPI_FUNC(void) _Py_ClearArgcArgv(void);
 
 
-/* --- _PyPreConfig ----------------------------------------------- */
+/* --- Helper functions ------------------------------------------- */
 
 PyAPI_FUNC(int) _Py_str_to_int(
     const char *str,
@@ -81,22 +74,20 @@
 PyAPI_FUNC(const char*) _Py_GetEnv(
     int use_environment,
     const char *name);
-
-PyAPI_FUNC(void) _PyPreConfig_Clear(_PyPreConfig *config);
-PyAPI_FUNC(int) _PyPreConfig_Copy(_PyPreConfig *config,
-    const _PyPreConfig *config2);
-PyAPI_FUNC(void) _PyPreConfig_GetGlobalConfig(_PyPreConfig *config);
-PyAPI_FUNC(void) _PyPreConfig_SetGlobalConfig(const _PyPreConfig *config);
 PyAPI_FUNC(void) _Py_get_env_flag(
     int use_environment,
     int *flag,
     const char *name);
+
+/* --- _PyPreConfig ----------------------------------------------- */
+
+PyAPI_FUNC(void) _PyPreConfig_Clear(_PyPreConfig *config);
+PyAPI_FUNC(int) _PyPreConfig_Copy(_PyPreConfig *config,
+    const _PyPreConfig *config2);
+PyAPI_FUNC(PyObject*) _PyPreConfig_AsDict(const _PyPreConfig *config);
 PyAPI_FUNC(_PyInitError) _PyPreConfig_Read(_PyPreConfig *config,
     const _PyArgv *args,
     const _PyCoreConfig *coreconfig);
-PyAPI_FUNC(PyObject*) _PyPreConfig_AsDict(const _PyPreConfig *config);
-PyAPI_FUNC(_PyInitError) _PyPreConfig_ReadFromArgv(_PyPreConfig *config,
-    const _PyArgv *args);
 PyAPI_FUNC(_PyInitError) _PyPreConfig_Write(_PyPreConfig *config);
 
 
@@ -109,10 +100,7 @@
 PyAPI_FUNC(_PyInitError) _PyCoreConfig_InitPathConfig(_PyCoreConfig *config);
 PyAPI_FUNC(_PyInitError) _PyCoreConfig_SetPathConfig(
     const _PyCoreConfig *config);
-PyAPI_FUNC(void) _PyCoreConfig_GetGlobalConfig(_PyCoreConfig *config);
-PyAPI_FUNC(void) _PyCoreConfig_SetGlobalConfig(const _PyCoreConfig *config);
-PyAPI_FUNC(_PyInitError) _PyCoreConfig_Read(_PyCoreConfig *config);
-PyAPI_FUNC(_PyInitError) _PyCoreConfig_ReadFromArgv(_PyCoreConfig *config,
+PyAPI_FUNC(_PyInitError) _PyCoreConfig_Read(_PyCoreConfig *config,
     const _PyArgv *args);
 PyAPI_FUNC(void) _PyCoreConfig_Write(const _PyCoreConfig *config);