[3.15] gh-153210: Restore accidental array.ArrayType removal (GH-153261) (#153274)

gh-153210: Restore accidental `array.ArrayType` removal (GH-153261)
(cherry picked from commit ac2e14b)

Co-authored-by: sobolevn <mail@sobolevn.me>

Author: miss-islington

Lib/test/test_array.py

@@ -38,6 +38,11 @@ def __init__(self, typecode, newarg=None):
 
 class MiscTest(unittest.TestCase):
 
+    def test_array_type_importable(self):
+        from array import ArrayType
+
+        self.assertIs(array.array, ArrayType)
+
     def test_array_is_sequence(self):
         self.assertIsInstance(array.array("B"), collections.abc.MutableSequence)
         self.assertIsInstance(array.array("B"), collections.abc.Reversible)

Modules/arraymodule.c

@@ -3502,6 +3502,12 @@ array_modexec(PyObject *m)
     CREATE_TYPE(m, state->ArrayIterType, &arrayiter_spec);
     Py_SET_TYPE(state->ArrayIterType, &PyType_Type);
 
+    // Older undocumented alias:
+    if (PyModule_AddObjectRef(m, "ArrayType",
+                              (PyObject *)state->ArrayType) < 0) {
+        return -1;
+    }
+
     PyObject *mutablesequence = PyImport_ImportModuleAttrString(
             "collections.abc", "MutableSequence");
     if (!mutablesequence) {