@@ -5592,12 +5592,15 @@ def through_new(cls):
             return cls, partial(cls.__new__, cls)
 
         def through_init(cls):
-            # Not subclassable, and tp_new is PyType_GenericNew, so reach
-            # tp_init through the __init__ slot wrapper on an instance.
+            # tp_new is PyType_GenericNew (or does no argument parsing), so
+            # reach tp_init through the __init__ slot wrapper on an instance.
             return cls, partial(cls.__init__, cls(1))
 
         entry_points = [
-            through_new(enumerate),   # the only non-test @vectorcall function
+            # Non-test @vectorcall functions.
+            through_new(enumerate),
+            through_new(bytes),
+            through_init(bytearray),
             through_new(ac_tester.VcNew),
             through_new(ac_tester.VcNewBase),
             through_new(ac_tester.VcKwOnly),
 
@@ -978,6 +978,7 @@ bytearray_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 }
 
 /*[clinic input]
+@vectorcall
 bytearray.__init__
 
     source as arg: object = NULL
@@ -989,7 +990,7 @@ bytearray.__init__
 static int
 bytearray___init___impl(PyByteArrayObject *self, PyObject *arg,
                         const char *encoding, const char *errors)
-/*[clinic end generated code: output=4ce1304649c2f8b3 input=1141a7122eefd7b9]*/
+/*[clinic end generated code: output=4ce1304649c2f8b3 input=24ddb84055f432dd]*/
 {
     Py_ssize_t count;
     PyObject *it;
@@ -3015,6 +3016,7 @@ PyTypeObject PyByteArray_Type = {
     PyType_GenericAlloc,                /* tp_alloc */
     bytearray_new,                      /* tp_new */
     PyObject_Free,                      /* tp_free */
+    .tp_vectorcall = bytearray_vectorcall,
     .tp_version_tag = _Py_TYPE_VERSION_BYTEARRAY,
 };
 
 
@@ -2879,6 +2879,7 @@ static PyObject *
 bytes_subtype_new(PyTypeObject *, PyObject *);
 
 /*[clinic input]
+@vectorcall
 @classmethod
 bytes.__new__ as bytes_new
 
@@ -2891,7 +2892,7 @@ bytes.__new__ as bytes_new
 static PyObject *
 bytes_new_impl(PyTypeObject *type, PyObject *x, const char *encoding,
                const char *errors)
-/*[clinic end generated code: output=1e0c471be311a425 input=f0a966d19b7262b4]*/
+/*[clinic end generated code: output=1e0c471be311a425 input=b0248d22e221a095]*/
 {
     PyObject *bytes;
     PyObject *func;
@@ -3277,6 +3278,7 @@ PyTypeObject PyBytes_Type = {
     bytes_alloc,                                /* tp_alloc */
     bytes_new,                                  /* tp_new */
     PyObject_Free,                              /* tp_free */
+    .tp_vectorcall = bytes_vectorcall,
     .tp_version_tag = _Py_TYPE_VERSION_BYTES,
     ._tp_iteritem = bytes_iteritem,
 };