Revert "WIP: remove the use of the _PyArg_CheckPositional private API"

This reverts commit dc4442d.

Author: Xmader

src/JSArrayProxy.cc

@@ -789,6 +789,10 @@ PyObject *JSArrayProxyMethodDefinitions::JSArrayProxy_insert(JSArrayProxy *self,
   Py_ssize_t index;
   PyObject *value;
 
+  if (!_PyArg_CheckPositional("insert", nargs, 2, 2)) {
+    return NULL;
+  }
+
   {
     Py_ssize_t ival = -1;
     PyObject *iobj = PyNumber_Index(args[0]);
@@ -895,6 +899,10 @@ PyObject *JSArrayProxyMethodDefinitions::JSArrayProxy_extend(JSArrayProxy *self,
 PyObject *JSArrayProxyMethodDefinitions::JSArrayProxy_pop(JSArrayProxy *self, PyObject *const *args, Py_ssize_t nargs) {
   Py_ssize_t index = -1;
 
+  if (!_PyArg_CheckPositional("pop", nargs, 0, 1)) {
+    return NULL;
+  }
+
   if (nargs >= 1) {
     Py_ssize_t ival = -1;
     PyObject *iobj = PyNumber_Index(args[0]);
@@ -979,6 +987,9 @@ PyObject *JSArrayProxyMethodDefinitions::JSArrayProxy_index(JSArrayProxy *self,
   Py_ssize_t start = 0;
   Py_ssize_t stop = PY_SSIZE_T_MAX;
 
+  if (!_PyArg_CheckPositional("index", nargs, 1, 3)) {
+    return NULL;
+  }
   value = args[0];
   if (nargs < 2) {
     goto skip_optional;

src/JSObjectProxy.cc

@@ -623,6 +623,9 @@ PyObject *JSObjectProxyMethodDefinitions::JSObjectProxy_get_method(JSObjectProxy
   PyObject *key;
   PyObject *default_value = Py_None;
 
+  if (!_PyArg_CheckPositional("get", nargs, 1, 2)) {
+    return NULL;
+  }
   key = args[0];
   if (nargs < 2) {
     goto skip_optional;
@@ -644,6 +647,9 @@ PyObject *JSObjectProxyMethodDefinitions::JSObjectProxy_setdefault_method(JSObje
   PyObject *key;
   PyObject *default_value = Py_None;
 
+  if (!_PyArg_CheckPositional("setdefault", nargs, 1, 2)) {
+    return NULL;
+  }
   key = args[0];
   if (nargs < 2) {
     goto skip_optional;
@@ -673,6 +679,9 @@ PyObject *JSObjectProxyMethodDefinitions::JSObjectProxy_pop_method(JSObjectProxy
   PyObject *key;
   PyObject *default_value = NULL;
 
+  if (!_PyArg_CheckPositional("pop", nargs, 1, 2)) {
+    return NULL;
+  }
   key = args[0];
   if (nargs < 2) {
     goto skip_optional;