diff --git a/Include/cpython/coreconfig.h b/Include/cpython/coreconfig.h
@@ -44,6 +44,10 @@ typedef struct {
    int _config_version;  /* Internal configuration version,
                             used for ABI compatibility */

    /* If greater than 0, enable isolated mode: sys.path contains
       neither the script's directory nor the user's site-packages directory.

@@ -111,8 +115,9 @@ typedef struct {

    int dev_mode;           /* Development mode. PYTHONDEVMODE, -X dev */

-    /* Memory allocator: PYTHONMALLOC env var */
-    PyMemAllocatorName allocator;
} _PyPreConfig;

PyAPI_FUNC(void) _PyPreConfig_InitPythonConfig(_PyPreConfig *config);
@@ -121,9 +126,16 @@ PyAPI_FUNC(void) _PyPreConfig_InitIsolatedConfig(_PyPreConfig *config);

/* --- _PyCoreConfig ---------------------------------------------- */

typedef struct {
    int _config_version;  /* Internal configuration version,
                             used for ABI compatibility */

    int isolated;         /* Isolated mode? see _PyPreConfig.isolated */
    int use_environment;  /* Use environment variables? see _PyPreConfig.use_environment */
@@ -401,19 +413,21 @@ PyAPI_FUNC(_PyInitError) _PyCoreConfig_InitPythonConfig(_PyCoreConfig *config);
PyAPI_FUNC(_PyInitError) _PyCoreConfig_InitIsolatedConfig(_PyCoreConfig *config);
PyAPI_FUNC(void) _PyCoreConfig_Clear(_PyCoreConfig *);
PyAPI_FUNC(_PyInitError) _PyCoreConfig_SetString(
    wchar_t **config_str,
    const wchar_t *str);
PyAPI_FUNC(_PyInitError) _PyCoreConfig_DecodeLocale(
    wchar_t **config_str,
    const char *str);
PyAPI_FUNC(_PyInitError) _PyCoreConfig_Read(_PyCoreConfig *config);
PyAPI_FUNC(_PyInitError) _PyCoreConfig_SetArgv(
    _PyCoreConfig *config,
    Py_ssize_t argc,
-    char **argv);
PyAPI_FUNC(_PyInitError) _PyCoreConfig_SetWideArgv(_PyCoreConfig *config,
    Py_ssize_t argc,
-    wchar_t **argv);

#ifdef __cplusplus
}

diff --git a/Include/internal/pycore_coreconfig.h b/Include/internal/pycore_coreconfig.h
@@ -63,8 +63,8 @@ PyAPI_FUNC(int) _PyWstrList_Extend(_PyWstrList *list,
typedef struct {
    Py_ssize_t argc;
    int use_bytes_argv;
-    char **bytes_argv;
-    wchar_t **wchar_argv;
} _PyArgv;

PyAPI_FUNC(_PyInitError) _PyArgv_AsWstrList(const _PyArgv *args,
@@ -121,6 +121,12 @@ PyAPI_FUNC(_PyInitError) _PyPreCmdline_Read(_PyPreCmdline *cmdline,
/* --- _PyPreConfig ----------------------------------------------- */

PyAPI_FUNC(void) _PyPreConfig_Init(_PyPreConfig *config);
PyAPI_FUNC(void) _PyPreConfig_Copy(_PyPreConfig *config,
    const _PyPreConfig *config2);
PyAPI_FUNC(PyObject*) _PyPreConfig_AsDict(const _PyPreConfig *config);