startswith and endswith don't accept None as slice index

Objects/bytearrayobject.c

 /* PyByteArray (bytearray) implementation */
 
 #define PY_SSIZE_T_CLEAN
 #include "Python.h"
 #include "structmember.h"
 #include "bytes_methods.h"
 
 static PyByteArrayObject *nullbytes = NULL;
 char _PyByteArray_empty_string[] = "";
 
@@ skipping 1064 matching lines @@
 
 
 Py_LOCAL_INLINE(Py_ssize_t)
 bytearray_find_internal(PyByteArrayObject *self, PyObject *args, int dir)
 {
     PyObject *subobj;
     Py_buffer subbuf;
     Py_ssize_t start=0, end=PY_SSIZE_T_MAX;
     Py_ssize_t res;
 
-    if (!PyArg_ParseTuple(args, "O|O&O&:find/rfind/index/rindex", &subobj,
-        _PyEval_SliceIndex, &start, _PyEval_SliceIndex, &end))
+    if (!stringlib_parse_args_finds("find/rfind/index/rindex",
+                                    args, &subobj, &start, &end))
         return -2;
     if (_getbuffer(subobj, &subbuf) < 0)
         return -2;
     if (dir > 0)
         res = stringlib_find_slice(
             PyByteArray_AS_STRING(self), PyByteArray_GET_SIZE(self),
             subbuf.buf, subbuf.len, start, end);
     else
         res = stringlib_rfind_slice(
             PyByteArray_AS_STRING(self), PyByteArray_GET_SIZE(self),
@@ skipping 29 matching lines @@
 
 static PyObject *
 bytearray_count(PyByteArrayObject *self, PyObject *args)
 {
     PyObject *sub_obj;
     const char *str = PyByteArray_AS_STRING(self);
     Py_ssize_t start = 0, end = PY_SSIZE_T_MAX;
     Py_buffer vsub;
     PyObject *count_obj;
 
-    if (!PyArg_ParseTuple(args, "O|O&O&:count", &sub_obj,
-        _PyEval_SliceIndex, &start, _PyEval_SliceIndex, &end))
+    if (!stringlib_parse_args_finds("count", args, &sub_obj, &start, &end))
         return NULL;
 
     if (_getbuffer(sub_obj, &vsub) < 0)
         return NULL;
 
     _adjust_indices(&start, &end, PyByteArray_GET_SIZE(self));
 
     count_obj = PyLong_FromSsize_t(
         stringlib_count(str + start, end - start, vsub.buf, vsub.len)
         );
@@ skipping 137 matching lines @@
 prefix can also be a tuple of strings to try.");
 
 static PyObject *
 bytearray_startswith(PyByteArrayObject *self, PyObject *args)
 {
     Py_ssize_t start = 0;
     Py_ssize_t end = PY_SSIZE_T_MAX;
     PyObject *subobj;
     int result;
 
-    if (!PyArg_ParseTuple(args, "O|O&O&:startswith", &subobj,
-        _PyEval_SliceIndex, &start, _PyEval_SliceIndex, &end))
+    if (!stringlib_parse_args_finds("startswith", args, &subobj, &start, &end))
         return NULL;
     if (PyTuple_Check(subobj)) {
         Py_ssize_t i;
         for (i = 0; i < PyTuple_GET_SIZE(subobj); i++) {
             result = _bytearray_tailmatch(self,
                                       PyTuple_GET_ITEM(subobj, i),
                                       start, end, -1);
             if (result == -1)
                 return NULL;
             else if (result) {
@@ skipping 18 matching lines @@
 suffix can also be a tuple of strings to try.");
 
 static PyObject *
 bytearray_endswith(PyByteArrayObject *self, PyObject *args)
 {
     Py_ssize_t start = 0;
     Py_ssize_t end = PY_SSIZE_T_MAX;
     PyObject *subobj;
     int result;
 
-    if (!PyArg_ParseTuple(args, "O|O&O&:endswith", &subobj,
-        _PyEval_SliceIndex, &start, _PyEval_SliceIndex, &end))
+    if (!stringlib_parse_args_finds("endswith", args, &subobj, &start, &end))
         return NULL;
     if (PyTuple_Check(subobj)) {
         Py_ssize_t i;
         for (i = 0; i < PyTuple_GET_SIZE(subobj); i++) {
             result = _bytearray_tailmatch(self,
                                       PyTuple_GET_ITEM(subobj, i),
                                       start, end, +1);
             if (result == -1)
                 return NULL;
             else if (result) {
@@ skipping 1996 matching lines @@
     }
     it = PyObject_GC_New(bytesiterobject, &PyByteArrayIter_Type);
     if (it == NULL)
         return NULL;
     it->it_index = 0;
     Py_INCREF(seq);
     it->it_seq = (PyByteArrayObject *)seq;
     _PyObject_GC_TRACK(it);
     return (PyObject *)it;
 }