BUG: cache coherence issue with chain indexing and setitem (GH7084)
Merge pull request #7087 from jreback/series_cache

BUG: cache coherence issue with chain indexing and setitem (GH7084)
BUG: use size attribute (not method call)
BUG: force float64 dtype in object results for groupby
BUG: DatetimeIndex cannot parse string ndarray with dayfirst
Merge pull request #7038 from sinhrks/dayfirst

BUG: DatetimeIndex cannot parse string ndarray with dayfirst
ENH/CLN: Add factorize to IndexOpsMixin
Merge pull request #7090 from sinhrks/factorize

ENH/CLN: Add factorize to IndexOpsMixin
BUG: unstack fails in PeriodIndex
Merge pull request #7089 from cpcloud/groupby-size-windows-bug

BUG: use size attribute (not method call)
Merge pull request #7041 from sinhrks/unstack

BUG: unstack fails in PeriodIndex
release conflict
REGR: Regression in groupby.nth() for out-of-bounds indexers (GH6621)
Merge pull request #7094 from jreback/groupby_nth_repr

REGR: Regression in groupby.nth() for out-of-bounds indexers (GH6621)
BUG: Datetime values in DataFrame.quantile()

Closes #6965

previously returned nonsense
Merge pull request #7093 from TomAugspurger/quantile-datetime

BUG: Let DataFrame.quantile() handle datetime
TST/CLN: centralize common validation methods in test_graphics