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Editing: istr.h

#ifndef _MULTIDICT_ISTR_H
#define _MULTIDICT_ISTR_H

#ifdef __cplusplus
extern "C" {
#endif

typedef struct {
    PyUnicodeObject str;
    PyObject * canonical;
} istrobject;

PyDoc_STRVAR(istr__doc__, "istr class implementation");

static PyTypeObject istr_type;

static inline void
istr_dealloc(istrobject *self)
{
    Py_XDECREF(self->canonical);
    PyUnicode_Type.tp_dealloc((PyObject*)self);
}

static inline PyObject *
istr_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
    PyObject *x = NULL;
    static char *kwlist[] = {"object", "encoding", "errors", 0};
    PyObject *encoding = NULL;
    PyObject *errors = NULL;
    PyObject *s = NULL;
    PyObject * ret = NULL;

if (!PyArg_ParseTupleAndKeywords(args, kwds, "|OOO:str",
                                     kwlist, &x, &encoding, &errors)) {
        return NULL;
    }
    if (x != NULL && Py_TYPE(x) == &istr_type) {
        Py_INCREF(x);
        return x;
    }
    ret = PyUnicode_Type.tp_new(type, args, kwds);
    if (!ret) {
        goto fail;
    }
    s =_PyObject_CallMethodId(ret, &PyId_lower, NULL);
    if (!s) {
        goto fail;
    }
    ((istrobject*)ret)->canonical = s;
    s = NULL;  /* the reference is stollen by .canonical */
    return ret;
fail:
    Py_XDECREF(ret);
    return NULL;
}

static PyTypeObject istr_type = {
    PyVarObject_HEAD_INIT(DEFERRED_ADDRESS(&PyType_Type), 0)
    "multidict._multidict.istr",
    sizeof(istrobject),
    .tp_dealloc = (destructor)istr_dealloc,
    .tp_flags = Py_TPFLAGS_DEFAULT
              | Py_TPFLAGS_BASETYPE
              | Py_TPFLAGS_UNICODE_SUBCLASS,
    .tp_doc = istr__doc__,
    .tp_base = DEFERRED_ADDRESS(&PyUnicode_Type),
    .tp_new = (newfunc)istr_new,
};

static inline int
istr_init(void)
{
    istr_type.tp_base = &PyUnicode_Type;
    if (PyType_Ready(&istr_type) < 0) {
        return -1;
    }
    return 0;
}

#ifdef __cplusplus
}
#endif
#endif

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