Improve RInterface::HistoND signature with an extra argument for weight #20816
Description
Explain what you would like to see improved and how.
According to the HistoND documentation, we are currently accepting a list of columns where the size matters:
root/tree/dataframe/inc/ROOT/RDF/RInterface.hxx
Line 2222 in f91f277
This should instead be aligned with other histogram actions signature, where the weight is a separate argument, e.g. for Histo3D
root/tree/dataframe/inc/ROOT/RDF/RInterface.hxx
Lines 2189 to 2190 in f91f277
Extracting this comment into a separate issue to keep better track of it #20664 (comment)
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