Objects from this class behave rather like data.frame objects, but are formal reference classes
so that computations with them use reference semantics
dataAn environment whose objects correspond to the "columns" of a data frame or matrix.
row.namesThe names for the "rows", treated as those in a data frame.
initialize(..., data = data.frame())This method takes data= as a named argument, but coerces it to be an environment,
instead of requiring that it already be one.
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