Natalia Mokeeva comments

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                                            Natalia Mokeeva

CLN: enforce deprecation of frequencies deprecated for offsets

> > but what should we do with aliases which are the same for both: period and offsets, such as "D", "B", "W", "WEEKDAY", "W-SUN”, etc.? > > I think...

BUG: DatetimeIndex.is_year_start breaks on double-digit frequencies

> @natmokval you'd done a bunch of work in this area, so this might be interesting to you to try fixing? > Yeah, sure, I would like to work on...

BUG: `DatetimeIndex.is_year_start` and `DatetimeIndex.is_quarter_start` always return False on double-digit frequencies

@MarcoGorelli could you please take a look at this PR? I think CI failures are unrelated to my changes.

DEPR: disallow parsing datetimes with mixed time zones unless `utc=True`

@MarcoGorelli, could you please take a look at this PR?

CLN: replace unnecessary `freq_to_period_freqstr` with `PeriodDtype` constructor

I replaced `freq_to_period_freqstr` with `PeriodDtype(obj)._freqstr / PeriodDtypeBase(obj._period_dtype_code, obj.n)._freqstr`. Now we don’t need the `function freq_to_period_freqstr`, which is why I removed it. One comment: In `pandas/core/arrays/period.py` in the definition of `raise_on_incompatible`...