Either of two groupings: GF: Gene, fraction FGF: Fraction, position, feature It finds which of these exists, and auto groups
size 2 logical vector, the is.null checks for each column,
which grouping to perform, default "GF" Gene & Fraction grouping. Alternative "FGF", Fraction & position & feature.
Normally not used directly!
a quote of the grouping to pass to data.table
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