commits: 220adbc65e0b8c46feddaa6984df4a3a1ce0af6b

This data as json

sha	message	author_date	committer_date	raw_author	raw_committer	repo	author	committer
220adbc65e0b8c46feddaa6984df4a3a1ce0af6b	sparse option to reindex and unstack (#3542) * Added fill_value for unstack * remove sparse option and fix unintended changes * a bug fix * Added sparse option to unstack and reindex * black * More tests * black * Remove sparse option from reindex * try __array_function__ where * flake8	2019-11-19T16:23:33Z	2019-11-19T16:23:33Z	caabe6633d9bef7f2f52807cc5a1f477f3a077d4	f10b21bed2846b879806f87039b77245b18e7671	13221727	6815844	1217238