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Commits on Aug 10, 2026
* BUG: SparseArray groupby mis-materialized the fill value (GH#64758) (#66690)
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* BUG: read_csv parallel path takes the corrupting path for falsy non-False low_memory (GH#66259) (#66686)
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* BUG: rolling cov/corr wrong after a large value leaves the window (GH#65739) (#66678)
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* BUG: unstack(sort=False) placed values under wrong row labels (GH#62816) (#66680)
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* BUG: concat with null[pyarrow] altered the other columns' dtype (GH#62343) (#66687)
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* BUG: composed DateOffset rejected on the array path (GH#66549) (#66689)
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* PERF: vectorize datetimelike array addition when the bounds allow it (GH#66552) (#66685)
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* DOC: Add default namespace xpath example to read_xml (#63668) (#66190)
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* BUG preserve index in Series.dt.to_pydatetime (#66444)
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* BUG: Period minus Period raised OverflowError for a count of INT64_MIN (GH#66552) (#66682)
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Commits on Aug 9, 2026
* CLN: Avoid custom script to run mypy stubtest (#66669)
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* BUG: setitem-with-expansion saturating or raising for integer EA dtypes (GH#65094) (#66677)
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* BUG: loc/iloc setitem transposing nested values on single-block frames (GH#65241) (#66676)
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* BUG: to_datetime/to_timedelta with narrow NumPy scalars and a unit (GH#56996) (#66671)
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* BUG: Timedelta divided by a float array saturated (GH#66552) (#66670)
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* BUG: Day offset added to a tz-aware DatetimeIndex wrapped or landed on the NaT sentinel (GH#66552) (#66679)
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* PERF: build read_csv pyarrow string columns without the GIL, deferring the wrap (#66277)
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* CI: Update pixi.lock & last 4 numpy/pyarrow versions tested (#66665)
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* BUG: Timedelta multiplied by a numeric array wrapped or saturated (GH#66552) (#66668)
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* BUG: PeriodIndex.from_fields rejects non-December quarterly freqs (#55784) (#66553)
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* PERF: use Arrow native path for str.partition when expand=True (#63602)
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* BUG: read_hdf returned a sentinel string for missing values appended to a MultiIndex level in an older file (GH#9604) (#66667)
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* DEPR: select_dtypes non-standard datetimetz/period dtype strings (GH#24558) (#66666)
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Commits on Aug 8, 2026
* BUG: Avoid NumPy 2.5 DeprecationWarning in Timedelta.view (#66621)
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* BUG: read_csv crashed instead of raising when an allocation failed mid-error (#66660)
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* BUG: Timedelta added to a timedelta64 array wrapped or landed on NaT (GH#66552) (#66661)
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* TST: add regression tests for already-fixed bug reports (#66654)
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* DOC: batch of user guide and docstring fixes (#66655)
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* BUG: DateOffset added to a datetime64 array landing on the NaT sentinel (GH#66552) (#66648)
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Commits on Aug 7, 2026
* DEPR: deprecate parsing quarterly strings in Timestamp, to_datetime, DatetimeIndex (#64645)
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* BUG: BusinessDay added to a datetime64 array wrapped or landed on NaT (GH#66552) (#66653)
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* TST: define all_reductions fixture in the EA tests (#66607)
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* DEPR: Deprecate passing integers to Period, PeriodArray/PeriodIndex (#65173)
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* DEPR: DatetimeIndex dayfirst, yearfirst, ambiguous keywords (#64647)
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* BUG: Week offset added to a datetime64 array wrapped or landed on NaT (GH#66552) (#66652)
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