spectrum (samples) passed as input to CentralMoments in FreeSoundExtractor, but default 'pdf' mode is not overridden

[aginum]

From FreesoundLowlevelDescriptors.cpp:

// Spectral Central Moments Statistics
Algorithm* cm = factory.create("CentralMoments",
                               "range", sampleRate * 0.5);
Algorithm* ds = factory.create("DistributionShape");
spec->output("spectrum") >> cm->input("array");
cm->output("centralMoments") >> ds->input("centralMoments");
ds->output("kurtosis") >> PC(pool, nameSpace + "spectral_kurtosis");
ds->output("spread") >> PC(pool, nameSpace + "spectral_spread");
ds->output("skewness")>> PC(pool, nameSpace + "spectral_skewness");

As far as I can see from this code fragment, magnitude spectrum is passed to cm as is and cm is initialized with default mode (which is pdf, expecting input data to be a probability density function values).

I assume proper mode for this input would be sample. Am I missing something?