TST: sql add tests for NaN handling
TST: fixup windows test from GH7092
Merge pull request #7100 from jorisvandenbossche/sql-tests

TST: sql add more tests (NaN handling, ..)
BUG: GroupBy doesnt preserve timezone
Merge pull request #7099 from sinhrks/grouptz

BUG: GroupBy doesn't preserve timezone
BUG: remove unique requirement rom MultiIndex.get_locs to enable
     multi-index slicing on non-unique multi-indexes (GH7106)
Merge pull request #7107 from jreback/mi_slicers

BUG: remove unique requirement rom MultiIndex.get_locs (GH7106)
ENH nlargest and nsmallest Series methods
wip
WIP: use fused types
DOC/REF: add docstrings and DRY it up
ENH: use object in fused types to allow object array in cython
TST: test all numeric types used
CLN: factor out special cases
CLN: better name for kth_type
ERR/TST: raise on object dtype