Averaging function doesn't seem to have the option to disable standard deviation computation

The function cdsutils.avg claims to have a kwarg that, if set to True, computes the standard deviation of the channel value during the averaging period. It is supposed to default to False. I find that it always is True, and I seem to be unable to disable it by explicitly setting the kawrg to False:

In [1]: import cdsutils as cds

In [2]: cds.__version__
Out[2]: '1.4.1'

In [3]: cds.avg(1, 'C1:LSC-TRX_OUT_DQ', stddev=False)
Out[3]: (-0.0003272574977017939, 0.00019590313103305475)

In [4]: cds.avg(1, 'C1:LSC-TRX_OUT_DQ', stddev=True)
Out[4]: (-0.0003266211424488574, 0.00019756986088493458)

In [5]: cds.avg(1, 'C1:LSC-TRX_OUT_DQ')
Out[5]: (-0.00031510856933891773, 0.000197390372311685)