Changing a MicroDataFrame's index makes its columns Series instead of MicroSeries

[MaxGhenis]

d = mdf.MicroDataFrame(dict(x=[1, 2, 3]), weights=[4, 5, 6])
d.x.__class__

microdf.generic.MicroSeries

d = mdf.MicroDataFrame(dict(x=[1, 2, 3]), weights=[4, 5, 6])
d.index = [1, 2, 3]
d.x.__class__

pandas.core.series.Series