BUG: fix concat to work with more iterables (GH8645)
BUG: Bug in setitem with empty indexer and unwanted coercion of dtypes (GH8669)
Merge pull request #8668 from waveform80/deque-concat

BUG: fix concat to work with more iterables (GH8645)
Merge pull request #8671 from jreback/coerce

BUG: Bug in setitem with empty indexer and unwanted coercion of dtypes (GH8669)
BUG: years-only in date_range uses current date (GH6961)
Merge pull request #8672 from rosnfeld/issue_6961

BUG: years-only in date_range uses current date (GH6961)
ENH: Series.str.split can return a DataFrame instead of Series of lists