diff -r 0f827775f7b7 Modules/posixmodule.c
--- a/Modules/posixmodule.c	Wed Feb 13 21:17:13 2013 -0500
+++ b/Modules/posixmodule.c	Thu Feb 14 12:59:40 2013 +0200
@@ -407,29 +407,31 @@
 {
     int overflow;
     long result;
-    if (PyFloat_Check(obj)) {
-        PyErr_SetString(PyExc_TypeError,
-                        "integer argument expected, got float");
+    PyObject *number = PyNumber_Index(obj);
+    if (number == NULL || !PyLong_Check(number)) {
+        PyErr_Format(PyExc_TypeError,
+                     "user id must be integer, not %.200s",
+                     obj->ob_type->tp_name);
         return 0;
     }
-    result = PyLong_AsLongAndOverflow(obj, &overflow);
+    result = PyLong_AsLongAndOverflow(number, &overflow);
     if (overflow < 0)
         goto OverflowDown;
     if (!overflow && result == -1) {
         /* error or -1 */
         if (PyErr_Occurred())
-            return 0;
+            goto Fail;
         *(uid_t *)p = (uid_t)-1;
     }
     else {
         /* unsigned uid_t */
         unsigned long uresult;
         if (overflow > 0) {
-            uresult = PyLong_AsUnsignedLong(obj);
+            uresult = PyLong_AsUnsignedLong(number);
             if (PyErr_Occurred()) {
                 if (PyErr_ExceptionMatches(PyExc_OverflowError))
                     goto OverflowUp;
-                return 0;
+                goto Fail;
             }
             if ((uid_t)uresult == (uid_t)-1)
                 goto OverflowUp;
@@ -448,11 +450,15 @@
 OverflowDown:
     PyErr_SetString(PyExc_OverflowError,
                     "user id is less than minimum");
-    return 0;
+    goto Fail;
 
 OverflowUp:
     PyErr_SetString(PyExc_OverflowError,
                     "user id is greater than maximum");
+    goto Fail;
+
+Fail:
+    Py_DECREF(number);
     return 0;
 }
 
@@ -461,29 +467,31 @@
 {
     int overflow;
     long result;
-    if (PyFloat_Check(obj)) {
-        PyErr_SetString(PyExc_TypeError,
-                        "integer argument expected, got float");
+    PyObject *number = PyNumber_Index(obj);
+    if (number == NULL || !PyLong_Check(number)) {
+        PyErr_Format(PyExc_TypeError,
+                     "group id must be integer, not %.200s",
+                     obj->ob_type->tp_name);
         return 0;
     }
-    result = PyLong_AsLongAndOverflow(obj, &overflow);
+    result = PyLong_AsLongAndOverflow(number, &overflow);
     if (overflow < 0)
         goto OverflowDown;
     if (!overflow && result == -1) {
         /* error or -1 */
         if (PyErr_Occurred())
-            return 0;
+            goto Fail;
         *(gid_t *)p = (gid_t)-1;
     }
     else {
         /* unsigned gid_t */
         unsigned long uresult;
         if (overflow > 0) {
-            uresult = PyLong_AsUnsignedLong(obj);
+            uresult = PyLong_AsUnsignedLong(number);
             if (PyErr_Occurred()) {
                 if (PyErr_ExceptionMatches(PyExc_OverflowError))
                     goto OverflowUp;
-                return 0;
+                goto Fail;
             }
             if ((gid_t)uresult == (gid_t)-1)
                 goto OverflowUp;
@@ -502,11 +510,15 @@
 OverflowDown:
     PyErr_SetString(PyExc_OverflowError,
                     "group id is less than minimum");
-    return 0;
+    goto Fail;
 
 OverflowUp:
     PyErr_SetString(PyExc_OverflowError,
                     "group id is greater than maximum");
+    goto Fail;
+
+Fail:
+    Py_DECREF(number);
     return 0;
 }
 #endif /* MS_WINDOWS */