ujson dumps NaN but doesn't load it

The mod_ujson_load function doesn't handle nan though it is a valid representation:

>>> import ujson
>>> ujson.dumps(float('nan'))
'nan'
>>> ujson.loads(ujson.dumps(float('nan')))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: syntax error in JSON

Quick hack to solve this (sorry couldn't immediately figure out how to get the nan constant), line 115 in modujson.c:

                } else if (S_CUR(s) == 'a' && S_NEXT(s) == 'n') {
                    S_NEXT(s);
                    next = mp_parse_num_decimal("nan", 3, false, false, NULL);

Start in modujson.c around line 115 and inspect mod_ujson_load's handling of numeric values. Reproduce the shown ujson.dumps/loads sequence, then verify that loading the dumped NaN no longer raises a JSON syntax error.