[maringuadarrama]

relativedelta.__init__ types days, weeks, hours, minutes, seconds and microseconds as int, but dateutil accepts floats for all of them and normalises them in _fix():

>>> from datetime import datetime
>>> from dateutil.relativedelta import relativedelta
>>> datetime(2024, 3, 1) + relativedelta(hours=1.5)
datetime.datetime(2024, 3, 1, 1, 30)
>>> relativedelta(hours=25.5)
relativedelta(days=+1, hours=+1.5)
>>> relativedelta(weeks=0.5)
relativedelta(days=+3.5)

Only years and months must be integral (ValueError: Non-integer years and months are ambiguous and not currently supported.), so they stay int, as do the absolute fields (year=, hour=, ...), which go to datetime.replace(). leapdays also accepts a float at runtime but counts days added in a leap year, so it stays int here.

The attributes stay int as well. A relativedelta built from float durations holds floats, so float would be the exact type, but widening the attributes would break existing code that reads rd.days as an int. I can widen them too if you'd prefer the exact types.

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