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'l' is long for PyArg_ParseTuple().

/*[clinic input]
brett_is_stinky_and_wrong
 l: long
[clinic start generated code]*/
PyDoc_STRVAR(brett_is_stinky_and_wrong__doc__,
"brett_is_stinky_and_wrong(l)");
#define BRETT_IS_STINKY_AND_WRONG_METHODDEF \
 {"brett_is_stinky_and_wrong", (PyCFunction)brett_is_stinky_and_wrong, METH_VARARGS|METH_KEYWORDS, brett_is_stinky_and_wrong__doc__},
static PyObject *
brett_is_stinky_and_wrong_impl(PyModuleDef *module, long l);
static PyObject *
brett_is_stinky_and_wrong(PyModuleDef *module, PyObject *args, PyObject *kwargs)
{
 PyObject *return_value = NULL;
 static char *_keywords[] = {"l", NULL};
 long l;
 if (!PyArg_ParseTupleAndKeywords(args, kwargs,
 "l:brett_is_stinky_and_wrong", _keywords,
 &l))
 goto exit;
 return_value = brett_is_stinky_and_wrong_impl(module, l);
exit:
 return return_value;
}
static PyObject *
brett_is_stinky_and_wrong_impl(PyModuleDef *module, long l)
/*[clinic end generated code: checksum=d16330187341a0ecea0bf7ab70ba5551200ceb3c]*/

So the docs don't mention this support anywhere. The 'l' format isn't listed in the table of legacy to Argument Clinic converters, nor is there a list of converters that only exist in Argument Clinic. So unless I read the section on return converters and inferred that if a return converter exists for long it exists as a argument converter I had no way of knowing the existence of long as a converter without reading the code.
So this is at least a doc bug.

See documentation patch for this issue attached to issue20346 (a duplicate of this).