Subtypes, such as numpy int64, are not considered instance of np.int.

Subtypes, such as numpy int64, are not considered instance of np.int. Use np.issubdtype instead. Issue exists when trying the crossfilter demo at /scripts/crossfilter.py.
This line returns false for int64 when running the crossfilter demo, resulting in the following error: http://pastebin.com/raw.php?i=KR5Yjd3P