diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index 8f9e813..c8d34c9 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -2147,7 +2147,7 @@
 round as builtin_round
 
     number: object
-    ndigits: object = NULL
+    ndigits: object = None
 
 Round a number to a given precision in decimal digits.
 
@@ -2157,7 +2157,7 @@
 
 static PyObject *
 builtin_round_impl(PyObject *module, PyObject *number, PyObject *ndigits)
-/*[clinic end generated code: output=ff0d9dd176c02ede input=854bc3a217530c3d]*/
+/*[clinic end generated code: output=ff0d9dd176c02ede input=275678471d7aca15]*/
 {
     PyObject *round, *result;
 
@@ -2175,7 +2175,7 @@
         return NULL;
     }
 
-    if (ndigits == NULL || ndigits == Py_None)
+    if (ndigits == Py_None)
         result = _PyObject_CallNoArg(round);
     else
         result = PyObject_CallFunctionObjArgs(round, ndigits, NULL);
diff --git a/Python/clinic/bltinmodule.c.h b/Python/clinic/bltinmodule.c.h
index 49608cc..b936b0c 100644
--- a/Python/clinic/bltinmodule.c.h
+++ b/Python/clinic/bltinmodule.c.h
@@ -719,7 +719,7 @@
     PyObject *argsbuf[2];
     Py_ssize_t noptargs = nargs + (kwnames ? PyTuple_GET_SIZE(kwnames) : 0) - 1;
     PyObject *number;
-    PyObject *ndigits = NULL;
+    PyObject *ndigits = Py_None;
 
     args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser, 1, 2, 0, argsbuf);
     if (!args) {
@@ -849,4 +849,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=1927f3c9abd00c35 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=4e118c2cd2cd98f3 input=a9049054013a1b77]*/
diff --git a/Python/clinic/context.c.h b/Python/clinic/context.c.h
index eedfc88..2ac8bf7 100644
--- a/Python/clinic/context.c.h
+++ b/Python/clinic/context.c.h
@@ -115,7 +115,7 @@
 }
 
 PyDoc_STRVAR(_contextvars_ContextVar_get__doc__,
-"get($self, default=None, /)\n"
+"get($self, default=<unrepresentable>, /)\n"
 "--\n"
 "\n"
 "Return a value for the context variable for the current context.\n"
@@ -177,4 +177,4 @@
 
 #define _CONTEXTVARS_CONTEXTVAR_RESET_METHODDEF    \
     {"reset", (PyCFunction)_contextvars_ContextVar_reset, METH_O, _contextvars_ContextVar_reset__doc__},
-/*[clinic end generated code: output=a86b66e1516c25d4 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=f2e42f34e358e179 input=a9049054013a1b77]*/
diff --git a/Python/clinic/import.c.h b/Python/clinic/import.c.h
index 743d002..e4867f3 100644
--- a/Python/clinic/import.c.h
+++ b/Python/clinic/import.c.h
@@ -300,7 +300,7 @@
 #if defined(HAVE_DYNAMIC_LOADING)
 
 PyDoc_STRVAR(_imp_create_dynamic__doc__,
-"create_dynamic($module, spec, file=None, /)\n"
+"create_dynamic($module, spec, file=<unrepresentable>, /)\n"
 "--\n"
 "\n"
 "Create an extension module.");
@@ -454,4 +454,4 @@
 #ifndef _IMP_EXEC_DYNAMIC_METHODDEF
     #define _IMP_EXEC_DYNAMIC_METHODDEF
 #endif /* !defined(_IMP_EXEC_DYNAMIC_METHODDEF) */
-/*[clinic end generated code: output=ff06f7cf4b73eb76 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=3dc495e9c64d944e input=a9049054013a1b77]*/
diff --git a/Python/clinic/sysmodule.c.h b/Python/clinic/sysmodule.c.h
index 93bc332..d2d1503 100644
--- a/Python/clinic/sysmodule.c.h
+++ b/Python/clinic/sysmodule.c.h
@@ -135,7 +135,7 @@
 sys_exit(PyObject *module, PyObject *const *args, Py_ssize_t nargs)
 {
     PyObject *return_value = NULL;
-    PyObject *status = NULL;
+    PyObject *status = Py_None;
 
     if (!_PyArg_CheckPositional("exit", nargs, 0, 1)) {
         goto exit;
@@ -1088,4 +1088,4 @@
 #ifndef SYS_GETANDROIDAPILEVEL_METHODDEF
     #define SYS_GETANDROIDAPILEVEL_METHODDEF
 #endif /* !defined(SYS_GETANDROIDAPILEVEL_METHODDEF) */
-/*[clinic end generated code: output=092edc868de055a6 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=273f9cec8bfcab91 input=a9049054013a1b77]*/
diff --git a/Python/sysmodule.c b/Python/sysmodule.c
index 57f7a9a..5175158 100644
--- a/Python/sysmodule.c
+++ b/Python/sysmodule.c
@@ -705,7 +705,7 @@
 /*[clinic input]
 sys.exit
 
-    status: object = NULL
+    status: object = None
     /
 
 Exit the interpreter by raising SystemExit(status).
@@ -718,7 +718,7 @@
 
 static PyObject *
 sys_exit_impl(PyObject *module, PyObject *status)
-/*[clinic end generated code: output=13870986c1ab2ec0 input=a737351f86685e9c]*/
+/*[clinic end generated code: output=13870986c1ab2ec0 input=b86ca9497baa94f2]*/
 {
     /* Raise SystemExit so callers may catch it or clean up. */
     PyErr_SetObject(PyExc_SystemExit, status);