+1

Author: skirpichev

Objects/longobject.c

@@ -217,12 +217,17 @@ PyObject *
 _PyLong_Copy(PyLongObject *src)
 {
     assert(src != NULL);
+    int sign;
 
     if (_PyLong_IsCompact(src)) {
         stwodigits ival = medium_value(src);
         if (IS_SMALL_INT(ival)) {
             return get_small_int((sdigit)ival);
         }
+        sign = _PyLong_CompactSign(src);
+    }
+    else {
+        sign = _PyLong_NonCompactSign(src);
     }
 
     Py_ssize_t size = _PyLong_DigitCount(src);
@@ -232,8 +237,9 @@ _PyLong_Copy(PyLongObject *src)
         PyErr_NoMemory();
         return NULL;
     }
-    _PyLong_SetSignAndDigitCount(result, _PyLong_Sign(src), size);
-    memcpy(result->long_value.ob_digit, src->long_value.ob_digit, size * sizeof(digit));
+    _PyLong_SetSignAndDigitCount(result, sign, size);
+    memcpy(result->long_value.ob_digit, src->long_value.ob_digit,
+           size * sizeof(digit));
     return (PyObject *)result;
 }