Objects from this class behave rather like
data.frame objects, but are formal reference classes
so that computations with them use reference semantics
An environment whose objects correspond to the "columns" of a data frame or matrix.
The 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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