String describing the inclusive side the intervals.
Either left, right, both or neither.
Examples
>>> interval = pd.Interval(left=1, right=2, closed='left')
>>> interval
Interval(1, 2, closed='left')
>>> interval.closed
'left'
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https://pandas.pydata.org/pandas-docs/version/2.3.0/reference/api/pandas.Interval.closed.html