plb in group by

[apeyi]

In the following code, I get that minDate is a list of datetimes but maxDate is just a datetime:

import polars as pl
import polars_business as plb
import datetime as dt

data = {"a": [1, 2], "date": [dt.datetime(2022, 2, 1), dt.datetime(2023, 2, 1)]}
df = pl.DataFrame(data)

(df
    .group_by(['a'])
    .agg(
        minDate=plb.col.date.min().bdt.offset_by('-3bd'),
        maxDate=plb.col.date.max().bdt.offset_by('3bd')
    )
)

This seems to come from subtracting rather than adding business days.

[MarcoGorelli]

Thanks @apeyi for the report! This looks like a bug, will take a look

[MarcoGorelli]

moving to an issue as it's a bug