--- a/mercurial/cext/bdiff.c	Sun Feb 20 16:13:57 2022 -0700
+++ b/mercurial/cext/bdiff.c	Sun Feb 20 16:09:02 2022 -0700
@@ -76,8 +76,7 @@
 
 	l.next = NULL;
 
-	if (!PyArg_ParseTuple(args, PY23("s*s*:bdiff", "y*y*:bdiff"), &ba,
-	                      &bb)) {
+	if (!PyArg_ParseTuple(args, "y*y*:bdiff", &ba, &bb)) {
 		return NULL;
 	}
 
@@ -233,7 +232,7 @@
 	Py_ssize_t nelts = 0, size, i, start = 0;
 	PyObject *result = NULL;
 
-	if (!PyArg_ParseTuple(args, PY23("s#", "y#"), &text, &size)) {
+	if (!PyArg_ParseTuple(args, "y#", &text, &size)) {
 		goto abort;
 	}
 	if (!size) {
@@ -299,8 +298,7 @@
 	    NULL, /* priv */
 	};
 
-	if (!PyArg_ParseTuple(args, PY23("s#s#", "y#y#"), &a.ptr, &la, &b.ptr,
-	                      &lb)) {
+	if (!PyArg_ParseTuple(args, "y#y#", &a.ptr, &la, &b.ptr, &lb)) {
 		return NULL;
 	}