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Name	Size	Permission	Date
clinic	[ DIR ]	drwxr-xr-x	2024-03-19 22:46
stringlib	[ DIR ]	drwxr-xr-x	2024-03-19 22:46
README	41 B	-rw-r--r--	2024-03-19 22:46
abstract.c	78.14 KB	-rw-r--r--	2024-03-19 22:46
abstract.gcda	24.84 KB	-rw-r--r--	2025-06-04 09:21
abstract.o	664.97 KB	-rw-r--r--	2025-06-04 09:22
accu.c	2.41 KB	-rw-r--r--	2024-03-19 22:46
accu.gcda	4.12 KB	-rw-r--r--	2025-06-04 09:21
accu.o	49.66 KB	-rw-r--r--	2025-06-04 09:22
boolobject.c	7.12 KB	-rw-r--r--	2024-03-19 22:46
boolobject.gcda	4.2 KB	-rw-r--r--	2025-06-04 09:21
boolobject.o	51.54 KB	-rw-r--r--	2025-06-04 09:22
bytearrayobject.c	72.53 KB	-rw-r--r--	2024-03-19 22:46
bytearrayobject.gcda	29.45 KB	-rw-r--r--	2025-06-04 09:21
bytearrayobject.o	837.34 KB	-rw-r--r--	2025-06-04 09:22
bytes_methods.c	21.14 KB	-rw-r--r--	2024-03-19 22:46
bytes_methods.gcda	8 KB	-rw-r--r--	2025-06-04 09:21
bytes_methods.o	269.63 KB	-rw-r--r--	2025-06-04 09:22
bytesobject.c	99.98 KB	-rw-r--r--	2024-03-19 22:46
bytesobject.gcda	32.01 KB	-rw-r--r--	2025-06-04 09:21
bytesobject.o	956.34 KB	-rw-r--r--	2025-06-04 09:22
call.c	27.29 KB	-rw-r--r--	2024-03-19 22:46
call.gcda	8.28 KB	-rw-r--r--	2025-06-04 09:21
call.o	339.1 KB	-rw-r--r--	2025-06-04 09:22
capsule.c	7.27 KB	-rw-r--r--	2024-03-19 22:46
capsule.gcda	5.2 KB	-rw-r--r--	2025-06-04 09:21
capsule.o	73.71 KB	-rw-r--r--	2025-06-04 09:22
cellobject.c	5.65 KB	-rw-r--r--	2024-03-19 22:46
cellobject.gcda	4.57 KB	-rw-r--r--	2025-06-04 09:21
cellobject.o	91.55 KB	-rw-r--r--	2025-06-04 09:22
classobject.c	17.99 KB	-rw-r--r--	2024-03-19 22:46
classobject.gcda	7.01 KB	-rw-r--r--	2025-06-04 09:21
classobject.o	149.12 KB	-rw-r--r--	2025-06-04 09:22
codeobject.c	42.38 KB	-rw-r--r--	2024-03-19 22:46
codeobject.gcda	10.02 KB	-rw-r--r--	2025-06-04 09:21
codeobject.o	320.38 KB	-rw-r--r--	2025-06-04 09:22
complexobject.c	30.92 KB	-rw-r--r--	2024-03-19 22:46
complexobject.gcda	8.7 KB	-rw-r--r--	2025-06-04 09:21
complexobject.o	221.24 KB	-rw-r--r--	2025-06-04 09:22
descrobject.c	62.59 KB	-rw-r--r--	2024-03-19 22:46
descrobject.gcda	13.57 KB	-rw-r--r--	2025-06-04 09:21
descrobject.o	441.51 KB	-rw-r--r--	2025-06-04 09:22
dict-common.h	2.22 KB	-rw-r--r--	2024-03-19 22:46
dictnotes.txt	5.96 KB	-rw-r--r--	2024-03-19 22:46
dictobject.c	148.87 KB	-rw-r--r--	2024-03-19 22:46
dictobject.gcda	28.55 KB	-rw-r--r--	2025-06-04 09:21
dictobject.o	1022.94 KB	-rw-r--r--	2025-06-04 09:22
enumobject.c	14.61 KB	-rw-r--r--	2024-03-19 22:46
enumobject.gcda	6.13 KB	-rw-r--r--	2025-06-04 09:21
enumobject.o	140.49 KB	-rw-r--r--	2025-06-04 09:22
exceptions.c	85.65 KB	-rw-r--r--	2024-03-19 22:46
exceptions.gcda	20.98 KB	-rw-r--r--	2025-06-04 09:21
exceptions.o	585.38 KB	-rw-r--r--	2025-06-04 09:22
fileobject.c	16.56 KB	-rw-r--r--	2024-03-19 22:46
fileobject.gcda	6.29 KB	-rw-r--r--	2025-06-04 09:21
fileobject.o	110.28 KB	-rw-r--r--	2025-06-04 09:22
floatobject.c	71.56 KB	-rw-r--r--	2024-03-19 22:46
floatobject.gcda	13 KB	-rw-r--r--	2025-06-04 09:21
floatobject.o	452.61 KB	-rw-r--r--	2025-06-04 09:22
frameobject.c	35.79 KB	-rw-r--r--	2024-03-19 22:46
frameobject.gcda	8.83 KB	-rw-r--r--	2025-06-04 09:21
frameobject.o	199.9 KB	-rw-r--r--	2025-06-04 09:22
funcobject.c	34.36 KB	-rw-r--r--	2024-03-19 22:46
funcobject.gcda	10.05 KB	-rw-r--r--	2025-06-04 09:21
funcobject.o	262.78 KB	-rw-r--r--	2025-06-04 09:22
genericaliasobject.c	18.02 KB	-rw-r--r--	2024-03-19 22:46
genericaliasobject.gcda	6.79 KB	-rw-r--r--	2025-06-04 09:21
genericaliasobject.o	155.11 KB	-rw-r--r--	2025-06-04 09:22
genobject.c	69.94 KB	-rw-r--r--	2024-03-19 22:46
genobject.gcda	12.37 KB	-rw-r--r--	2025-06-04 09:21
genobject.o	327.76 KB	-rw-r--r--	2025-06-04 09:22
interpreteridobject.c	8.74 KB	-rw-r--r--	2024-03-19 22:46
interpreteridobject.gcda	4.75 KB	-rw-r--r--	2025-06-04 09:21
interpreteridobject.o	84.54 KB	-rw-r--r--	2025-06-04 09:22
iterobject.c	16.14 KB	-rw-r--r--	2024-03-19 22:46
iterobject.gcda	6.17 KB	-rw-r--r--	2025-06-04 09:21
iterobject.o	126.71 KB	-rw-r--r--	2025-06-04 09:22
listobject.c	99.53 KB	-rw-r--r--	2024-03-19 22:46
listobject.gcda	18.98 KB	-rw-r--r--	2025-06-04 09:21
listobject.o	739.52 KB	-rw-r--r--	2025-06-04 09:22
listsort.txt	35.31 KB	-rw-r--r--	2024-03-19 22:46
lnotab_notes.txt	8.62 KB	-rw-r--r--	2024-03-19 22:46
longobject.c	174.76 KB	-rw-r--r--	2024-03-19 22:46
longobject.gcda	30.25 KB	-rw-r--r--	2025-06-04 09:21
longobject.o	1.58 MB	-rw-r--r--	2025-06-04 09:22
memoryobject.c	94.86 KB	-rw-r--r--	2024-03-19 22:46
memoryobject.gcda	20.69 KB	-rw-r--r--	2025-06-04 09:21
memoryobject.o	497.3 KB	-rw-r--r--	2025-06-04 09:22
methodobject.c	17.16 KB	-rw-r--r--	2024-03-19 22:46
methodobject.gcda	6.73 KB	-rw-r--r--	2025-06-04 09:21
methodobject.o	172.39 KB	-rw-r--r--	2025-06-04 09:22
moduleobject.c	27.12 KB	-rw-r--r--	2024-03-19 22:46
moduleobject.gcda	10.06 KB	-rw-r--r--	2025-06-04 09:21
moduleobject.o	206.68 KB	-rw-r--r--	2025-06-04 09:22
namespaceobject.c	7.35 KB	-rw-r--r--	2024-03-19 22:46
namespaceobject.gcda	4.75 KB	-rw-r--r--	2025-06-04 09:21
namespaceobject.o	73.17 KB	-rw-r--r--	2025-06-04 09:22
object.c	62.92 KB	-rw-r--r--	2024-03-19 22:46
object.gcda	16.35 KB	-rw-r--r--	2025-06-04 09:21
object.o	427.98 KB	-rw-r--r--	2025-06-04 09:22
obmalloc.c	98.82 KB	-rw-r--r--	2024-03-19 22:46
obmalloc.gcda	13.52 KB	-rw-r--r--	2025-06-04 09:21
obmalloc.o	338.32 KB	-rw-r--r--	2025-06-04 09:22
odictobject.c	73.79 KB	-rw-r--r--	2024-03-19 22:46
odictobject.gcda	11.84 KB	-rw-r--r--	2025-06-04 09:21
odictobject.o	297.43 KB	-rw-r--r--	2025-06-04 09:22
picklebufobject.c	6.03 KB	-rw-r--r--	2024-03-19 22:46
picklebufobject.gcda	4.49 KB	-rw-r--r--	2025-06-04 09:21
picklebufobject.o	54.4 KB	-rw-r--r--	2025-06-04 09:22
rangeobject.c	36.25 KB	-rw-r--r--	2024-03-19 22:46
rangeobject.gcda	8.72 KB	-rw-r--r--	2025-06-04 09:21
rangeobject.o	321.02 KB	-rw-r--r--	2025-06-04 09:22
setobject.c	72.7 KB	-rw-r--r--	2024-03-19 22:46
setobject.gcda	17.04 KB	-rw-r--r--	2025-06-04 09:21
setobject.o	617.43 KB	-rw-r--r--	2025-06-04 09:22
sliceobject.c	19.36 KB	-rw-r--r--	2024-03-19 22:46
sliceobject.gcda	6.45 KB	-rw-r--r--	2025-06-04 09:21
sliceobject.o	146.79 KB	-rw-r--r--	2025-06-04 09:22
structseq.c	16.74 KB	-rw-r--r--	2024-03-19 22:46
structseq.gcda	6.29 KB	-rw-r--r--	2025-06-04 09:21
structseq.o	160.08 KB	-rw-r--r--	2025-06-04 09:22
tupleobject.c	33.24 KB	-rw-r--r--	2024-03-19 22:46
tupleobject.gcda	9.63 KB	-rw-r--r--	2025-06-04 09:21
tupleobject.o	262.6 KB	-rw-r--r--	2025-06-04 09:22
typeobject.c	268.84 KB	-rw-r--r--	2024-03-19 22:46
typeobject.gcda	55.95 KB	-rw-r--r--	2025-06-04 09:21
typeobject.o	1.62 MB	-rw-r--r--	2025-06-04 09:22
typeslots.inc	5.33 KB	-rw-r--r--	2024-03-19 22:46
typeslots.py	1.65 KB	-rwxr-xr-x	2024-03-19 22:46
unicodectype.c	7.49 KB	-rw-r--r--	2024-03-19 22:46
unicodectype.gcda	6.14 KB	-rw-r--r--	2025-06-04 09:21
unicodectype.o	199.91 KB	-rw-r--r--	2025-06-04 09:22
unicodeobject.c	475.94 KB	-rw-r--r--	2024-03-19 22:46
unicodeobject.gcda	108.06 KB	-rw-r--r--	2025-06-04 09:21
unicodeobject.o	3.93 MB	-rw-r--r--	2025-06-04 09:22
unicodetype_db.h	249.58 KB	-rw-r--r--	2024-03-19 22:46
unionobject.c	13.1 KB	-rw-r--r--	2024-03-19 22:46
unionobject.gcda	5.98 KB	-rw-r--r--	2025-06-04 09:21
unionobject.o	139.22 KB	-rw-r--r--	2025-06-04 09:22
weakrefobject.c	31.57 KB	-rw-r--r--	2024-03-19 22:46
weakrefobject.gcda	15.45 KB	-rw-r--r--	2025-06-04 09:21
weakrefobject.o	328.2 KB	-rw-r--r--	2025-06-04 09:22

Rename

// types.UnionType -- used to represent e.g. Union[int, str], int | str
#include "Python.h"
#include "pycore_object.h"  // _PyObject_GC_TRACK/UNTRACK
#include "pycore_unionobject.h"
#include "structmember.h"

static PyObject *make_union(PyObject *);

typedef struct {
    PyObject_HEAD
    PyObject *args;
    PyObject *parameters;
} unionobject;

static void
unionobject_dealloc(PyObject *self)
{
    unionobject *alias = (unionobject *)self;

_PyObject_GC_UNTRACK(self);

Py_XDECREF(alias->args);
    Py_XDECREF(alias->parameters);
    Py_TYPE(self)->tp_free(self);
}

static int
union_traverse(PyObject *self, visitproc visit, void *arg)
{
    unionobject *alias = (unionobject *)self;
    Py_VISIT(alias->args);
    Py_VISIT(alias->parameters);
    return 0;
}

static Py_hash_t
union_hash(PyObject *self)
{
    unionobject *alias = (unionobject *)self;
    PyObject *args = PyFrozenSet_New(alias->args);
    if (args == NULL) {
        return (Py_hash_t)-1;
    }
    Py_hash_t hash = PyObject_Hash(args);
    Py_DECREF(args);
    return hash;
}

static int
is_generic_alias_in_args(PyObject *args)
{
    Py_ssize_t nargs = PyTuple_GET_SIZE(args);
    for (Py_ssize_t iarg = 0; iarg < nargs; iarg++) {
        PyObject *arg = PyTuple_GET_ITEM(args, iarg);
        if (_PyGenericAlias_Check(arg)) {
            return 0;
        }
    }
    return 1;
}

static PyObject *
union_instancecheck(PyObject *self, PyObject *instance)
{
    unionobject *alias = (unionobject *) self;
    Py_ssize_t nargs = PyTuple_GET_SIZE(alias->args);
    if (!is_generic_alias_in_args(alias->args)) {
        PyErr_SetString(PyExc_TypeError,
            "isinstance() argument 2 cannot contain a parameterized generic");
        return NULL;
    }
    for (Py_ssize_t iarg = 0; iarg < nargs; iarg++) {
        PyObject *arg = PyTuple_GET_ITEM(alias->args, iarg);
        if (PyType_Check(arg)) {
            int res = PyObject_IsInstance(instance, arg);
            if (res < 0) {
                return NULL;
            }
            if (res) {
                Py_RETURN_TRUE;
            }
        }
    }
    Py_RETURN_FALSE;
}

static PyObject *
union_subclasscheck(PyObject *self, PyObject *instance)
{
    if (!PyType_Check(instance)) {
        PyErr_SetString(PyExc_TypeError, "issubclass() arg 1 must be a class");
        return NULL;
    }
    unionobject *alias = (unionobject *)self;
    if (!is_generic_alias_in_args(alias->args)) {
        PyErr_SetString(PyExc_TypeError,
            "issubclass() argument 2 cannot contain a parameterized generic");
        return NULL;
    }
    Py_ssize_t nargs = PyTuple_GET_SIZE(alias->args);
    for (Py_ssize_t iarg = 0; iarg < nargs; iarg++) {
        PyObject *arg = PyTuple_GET_ITEM(alias->args, iarg);
        if (PyType_Check(arg)) {
            int res = PyObject_IsSubclass(instance, arg);
            if (res < 0) {
                return NULL;
            }
            if (res) {
                Py_RETURN_TRUE;
            }
        }
    }
    Py_RETURN_FALSE;
}

static PyObject *
union_richcompare(PyObject *a, PyObject *b, int op)
{
    if (!_PyUnion_Check(b) || (op != Py_EQ && op != Py_NE)) {
        Py_RETURN_NOTIMPLEMENTED;
    }

PyObject *a_set = PySet_New(((unionobject*)a)->args);
    if (a_set == NULL) {
        return NULL;
    }
    PyObject *b_set = PySet_New(((unionobject*)b)->args);
    if (b_set == NULL) {
        Py_DECREF(a_set);
        return NULL;
    }
    PyObject *result = PyObject_RichCompare(a_set, b_set, op);
    Py_DECREF(b_set);
    Py_DECREF(a_set);
    return result;
}

static PyObject*
flatten_args(PyObject* args)
{
    Py_ssize_t arg_length = PyTuple_GET_SIZE(args);
    Py_ssize_t total_args = 0;
    // Get number of total args once it's flattened.
    for (Py_ssize_t i = 0; i < arg_length; i++) {
        PyObject *arg = PyTuple_GET_ITEM(args, i);
        if (_PyUnion_Check(arg)) {
            total_args += PyTuple_GET_SIZE(((unionobject*) arg)->args);
        } else {
            total_args++;
        }
    }
    // Create new tuple of flattened args.
    PyObject *flattened_args = PyTuple_New(total_args);
    if (flattened_args == NULL) {
        return NULL;
    }
    Py_ssize_t pos = 0;
    for (Py_ssize_t i = 0; i < arg_length; i++) {
        PyObject *arg = PyTuple_GET_ITEM(args, i);
        if (_PyUnion_Check(arg)) {
            PyObject* nested_args = ((unionobject*)arg)->args;
            Py_ssize_t nested_arg_length = PyTuple_GET_SIZE(nested_args);
            for (Py_ssize_t j = 0; j < nested_arg_length; j++) {
                PyObject* nested_arg = PyTuple_GET_ITEM(nested_args, j);
                Py_INCREF(nested_arg);
                PyTuple_SET_ITEM(flattened_args, pos, nested_arg);
                pos++;
            }
        } else {
            if (arg == Py_None) {
                arg = (PyObject *)&_PyNone_Type;
            }
            Py_INCREF(arg);
            PyTuple_SET_ITEM(flattened_args, pos, arg);
            pos++;
        }
    }
    assert(pos == total_args);
    return flattened_args;
}

static PyObject*
dedup_and_flatten_args(PyObject* args)
{
    args = flatten_args(args);
    if (args == NULL) {
        return NULL;
    }
    Py_ssize_t arg_length = PyTuple_GET_SIZE(args);
    PyObject *new_args = PyTuple_New(arg_length);
    if (new_args == NULL) {
        Py_DECREF(args);
        return NULL;
    }
    // Add unique elements to an array.
    Py_ssize_t added_items = 0;
    for (Py_ssize_t i = 0; i < arg_length; i++) {
        int is_duplicate = 0;
        PyObject* i_element = PyTuple_GET_ITEM(args, i);
        for (Py_ssize_t j = 0; j < added_items; j++) {
            PyObject* j_element = PyTuple_GET_ITEM(new_args, j);
            int is_ga = _PyGenericAlias_Check(i_element) &&
                        _PyGenericAlias_Check(j_element);
            // RichCompare to also deduplicate GenericAlias types (slower)
            is_duplicate = is_ga ? PyObject_RichCompareBool(i_element, j_element, Py_EQ)
                : i_element == j_element;
            // Should only happen if RichCompare fails
            if (is_duplicate < 0) {
                Py_DECREF(args);
                Py_DECREF(new_args);
                return NULL;
            }
            if (is_duplicate)
                break;
        }
        if (!is_duplicate) {
            Py_INCREF(i_element);
            PyTuple_SET_ITEM(new_args, added_items, i_element);
            added_items++;
        }
    }
    Py_DECREF(args);
    _PyTuple_Resize(&new_args, added_items);
    return new_args;
}

static int
is_unionable(PyObject *obj)
{
    return (obj == Py_None ||
        PyType_Check(obj) ||
        _PyGenericAlias_Check(obj) ||
        _PyUnion_Check(obj));
}

PyObject *
_Py_union_type_or(PyObject* self, PyObject* other)
{
    if (!is_unionable(self) || !is_unionable(other)) {
        Py_RETURN_NOTIMPLEMENTED;
    }

PyObject *tuple = PyTuple_Pack(2, self, other);
    if (tuple == NULL) {
        return NULL;
    }

PyObject *new_union = make_union(tuple);
    Py_DECREF(tuple);
    return new_union;
}

static int
union_repr_item(_PyUnicodeWriter *writer, PyObject *p)
{
    _Py_IDENTIFIER(__module__);
    _Py_IDENTIFIER(__qualname__);
    _Py_IDENTIFIER(__origin__);
    _Py_IDENTIFIER(__args__);
    PyObject *qualname = NULL;
    PyObject *module = NULL;
    PyObject *tmp;
    PyObject *r = NULL;
    int err;

if (p == (PyObject *)&_PyNone_Type) {
        return _PyUnicodeWriter_WriteASCIIString(writer, "None", 4);
    }

if (_PyObject_LookupAttrId(p, &PyId___origin__, &tmp) < 0) {
        goto exit;
    }

if (tmp) {
        Py_DECREF(tmp);
        if (_PyObject_LookupAttrId(p, &PyId___args__, &tmp) < 0) {
            goto exit;
        }
        if (tmp) {
            // It looks like a GenericAlias
            Py_DECREF(tmp);
            goto use_repr;
        }
    }

if (_PyObject_LookupAttrId(p, &PyId___qualname__, &qualname) < 0) {
        goto exit;
    }
    if (qualname == NULL) {
        goto use_repr;
    }
    if (_PyObject_LookupAttrId(p, &PyId___module__, &module) < 0) {
        goto exit;
    }
    if (module == NULL || module == Py_None) {
        goto use_repr;
    }

// Looks like a class
    if (PyUnicode_Check(module) &&
        _PyUnicode_EqualToASCIIString(module, "builtins"))
    {
        // builtins don't need a module name
        r = PyObject_Str(qualname);
        goto exit;
    }
    else {
        r = PyUnicode_FromFormat("%S.%S", module, qualname);
        goto exit;
    }

use_repr:
    r = PyObject_Repr(p);
exit:
    Py_XDECREF(qualname);
    Py_XDECREF(module);
    if (r == NULL) {
        return -1;
    }
    err = _PyUnicodeWriter_WriteStr(writer, r);
    Py_DECREF(r);
    return err;
}

static PyObject *
union_repr(PyObject *self)
{
    unionobject *alias = (unionobject *)self;
    Py_ssize_t len = PyTuple_GET_SIZE(alias->args);

_PyUnicodeWriter writer;
    _PyUnicodeWriter_Init(&writer);
     for (Py_ssize_t i = 0; i < len; i++) {
        if (i > 0 && _PyUnicodeWriter_WriteASCIIString(&writer, " | ", 3) < 0) {
            goto error;
        }
        PyObject *p = PyTuple_GET_ITEM(alias->args, i);
        if (union_repr_item(&writer, p) < 0) {
            goto error;
        }
    }
    return _PyUnicodeWriter_Finish(&writer);
error:
    _PyUnicodeWriter_Dealloc(&writer);
    return NULL;
}

static PyMemberDef union_members[] = {
        {"__args__", T_OBJECT, offsetof(unionobject, args), READONLY},
        {0}
};

static PyMethodDef union_methods[] = {
        {"__instancecheck__", union_instancecheck, METH_O},
        {"__subclasscheck__", union_subclasscheck, METH_O},
        {0}};

static PyObject *
union_getitem(PyObject *self, PyObject *item)
{
    unionobject *alias = (unionobject *)self;
    // Populate __parameters__ if needed.
    if (alias->parameters == NULL) {
        alias->parameters = _Py_make_parameters(alias->args);
        if (alias->parameters == NULL) {
            return NULL;
        }
    }

PyObject *newargs = _Py_subs_parameters(self, alias->args, alias->parameters, item);
    if (newargs == NULL) {
        return NULL;
    }

PyObject *res;
    Py_ssize_t nargs = PyTuple_GET_SIZE(newargs);
    if (nargs == 0) {
        res = make_union(newargs);
    }
    else {
        res = PyTuple_GET_ITEM(newargs, 0);
        Py_INCREF(res);
        for (Py_ssize_t iarg = 1; iarg < nargs; iarg++) {
            PyObject *arg = PyTuple_GET_ITEM(newargs, iarg);
            Py_SETREF(res, PyNumber_Or(res, arg));
            if (res == NULL) {
                break;
            }
        }
    }
    Py_DECREF(newargs);
    return res;
}

static PyMappingMethods union_as_mapping = {
    .mp_subscript = union_getitem,
};

static PyObject *
union_parameters(PyObject *self, void *Py_UNUSED(unused))
{
    unionobject *alias = (unionobject *)self;
    if (alias->parameters == NULL) {
        alias->parameters = _Py_make_parameters(alias->args);
        if (alias->parameters == NULL) {
            return NULL;
        }
    }
    Py_INCREF(alias->parameters);
    return alias->parameters;
}

static PyGetSetDef union_properties[] = {
    {"__parameters__", union_parameters, (setter)NULL, "Type variables in the types.UnionType.", NULL},
    {0}
};

static PyNumberMethods union_as_number = {
        .nb_or = _Py_union_type_or, // Add __or__ function
};

static const char* const cls_attrs[] = {
        "__module__",  // Required for compatibility with typing module
        NULL,
};

static PyObject *
union_getattro(PyObject *self, PyObject *name)
{
    unionobject *alias = (unionobject *)self;
    if (PyUnicode_Check(name)) {
        for (const char * const *p = cls_attrs; ; p++) {
            if (*p == NULL) {
                break;
            }
            if (_PyUnicode_EqualToASCIIString(name, *p)) {
                return PyObject_GetAttr((PyObject *) Py_TYPE(alias), name);
            }
        }
    }
    return PyObject_GenericGetAttr(self, name);
}

PyTypeObject _PyUnion_Type = {
    PyVarObject_HEAD_INIT(&PyType_Type, 0)
    .tp_name = "types.UnionType",
    .tp_doc = PyDoc_STR("Represent a PEP 604 union type\n"
              "\n"
              "E.g. for int | str"),
    .tp_basicsize = sizeof(unionobject),
    .tp_dealloc = unionobject_dealloc,
    .tp_alloc = PyType_GenericAlloc,
    .tp_free = PyObject_GC_Del,
    .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,
    .tp_traverse = union_traverse,
    .tp_hash = union_hash,
    .tp_getattro = union_getattro,
    .tp_members = union_members,
    .tp_methods = union_methods,
    .tp_richcompare = union_richcompare,
    .tp_as_mapping = &union_as_mapping,
    .tp_as_number = &union_as_number,
    .tp_repr = union_repr,
    .tp_getset = union_properties,
};

static PyObject *
make_union(PyObject *args)
{
    assert(PyTuple_CheckExact(args));

args = dedup_and_flatten_args(args);
    if (args == NULL) {
        return NULL;
    }
    if (PyTuple_GET_SIZE(args) == 1) {
        PyObject *result1 = PyTuple_GET_ITEM(args, 0);
        Py_INCREF(result1);
        Py_DECREF(args);
        return result1;
    }

unionobject *result = PyObject_GC_New(unionobject, &_PyUnion_Type);
    if (result == NULL) {
        Py_DECREF(args);
        return NULL;
    }

result->parameters = NULL;
    result->args = args;
    _PyObject_GC_TRACK(result);
    return (PyObject*)result;
}