commits: ee44478ed921ae3afdece9d16dc179a197727e8d

This data as json

sha	message	author_date	committer_date	raw_author	raw_committer	repo	author	committer
ee44478ed921ae3afdece9d16dc179a197727e8d	Change an `==` to an `is`. Fix tests so that this won't happen again. (#2648) * Change an `==` to an `is`. Fix tests so that this won't happen again. Closes #2647 and re-affirms #1988. * Reuse the same _CONCAT_DIM_DEFAULT object	2019-01-05T06:46:34Z	2019-01-05T06:46:34Z	a16c8e98a08a3240759f03f2b97cd404a01a8eff	f10b21bed2846b879806f87039b77245b18e7671	13221727	291576	1217238