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Add PyLong_GetSign() function (#99)

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`@@ -26,6 +26,13 @@ Latest version of the header file:`
`26`	`26`	`pythoncapi_compat.h<https://raw.githubusercontent.com/python/pythoncapi-compat/master/pythoncapi_compat.h>`_.
`27`	`27`
`28`	`28`
	`29`	`+Python 3.14`
	`30`	`+-----------`
	`31`	`+`
	`32`	`+..c:function::intPyLong_GetSign(PyObject obj, int sign)`
	`33`	`+`
	`34`	+ See `PyLong_GetSign() documentation<https://docs.python.org/dev/c-api/long.html#c.PyLong_GetSign>`__.
	`35`	`+`
`29`	`36`	`Python 3.13`
`30`	`37`	`-----------`
`31`	`38`

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`@@ -1,6 +1,7 @@`
`1`	`1`	`Changelog`
`2`	`2`	`=========`
`3`	`3`
	`4`	+* 2024-06-03: Add ``PyLong_GetSign()``.
`4`	`5`	`* 2024-04-23: Drop Python 3.5 support. It cannot be tested anymore (pip fails).`
`5`	`6`	* 2024-04-02: Add ``PyDict_SetDefaultRef()`` function.
`6`	`7`	* 2024-03-29: Add ``PyList_GetItemRef()`` function.

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`@@ -1339,6 +1339,21 @@ PyDict_SetDefaultRef(PyObject d, PyObject key, PyObject *default_value,`
`1339`	`1339`	`#endif`
`1340`	`1340`
`1341`	`1341`
	`1342`	`+// gh-116560 added PyLong_GetSign() to Python 3.14a4`
	`1343`	`+#if PY_VERSION_HEX < 0x030E00A1`
	`1344`	`+staticinlineintPyLong_GetSign(PyObject obj,int sign)`
	`1345`	`+{`
	`1346`	`+if (!PyLong_Check(obj)) {`
	`1347`	`+PyErr_Format(PyExc_TypeError,"expect int, got %s",Py_TYPE(obj)->tp_name);`
	`1348`	`+return -1;`
	`1349`	`+ }`
	`1350`	`+`
	`1351`	`+ *sign =_PyLong_Sign(obj);`
	`1352`	`+return0;`
	`1353`	`+}`
	`1354`	`+#endif`
	`1355`	`+`
	`1356`	`+`
`1342`	`1357`	`#ifdef __cplusplus`
`1343`	`1358`	`}`
`1344`	`1359`	`#endif`

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`@@ -53,6 +53,7 @@`
`53`	`53`	`// Marker to check that pointer value was set`
`54`	`54`	`staticconstcharuninitialized[]="uninitialized";`
`55`	`55`	`#defineUNINITIALIZED_OBJ ((PyObject *)uninitialized)`
	`56`	`+#defineUNINITIALIZED_INT 0x83ff979`
`56`	`57`
`57`	`58`
`58`	`59`	`staticPyObject*`
`@@ -1413,6 +1414,11 @@ test_long_api(PyObject Py_UNUSED(module), PyObject Py_UNUSED(args))`
`1413`	`1414`	`PyErr_Clear();`
`1414`	`1415`	`Py_DECREF(obj2);`
`1415`	`1416`
	`1417`	`+// test PyLong_GetSign()`
	`1418`	`+intsign=UNINITIALIZED_INT;`
	`1419`	`+assert(PyLong_GetSign(obj,&sign)==0);`
	`1420`	`+assert(sign==1);`
	`1421`	`+`
`1416`	`1422`	`Py_RETURN_NONE;`
`1417`	`1423`	`}`
`1418`	`1424`

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