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  grouped/sorted, the grouping is unchanged.  This is useful for
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  grouped/sorted, the grouping is unchanged.  This is useful for
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  aggregation and is particularly fast for character vectors.
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  aggregation and is particularly fast for character vectors.
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  Under the covers, the \code{"radix"} method of \code{\link{order}} is
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  Under the covers, the \code{"radix"} method of \code{\link{order}} is
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  used, and the same caveats apply, including restrictions on character
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  used, and the same caveats apply, including restrictions on character
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  encodings and lack of support for long vectors (those with
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  encodings and lack of support for \link{long vectors} (those with
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  \eqn{2^{31}}{2^31} or more elements). Real-valued numbers are slightly
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  \eqn{2^{31}}{2^31} or more elements). Real-valued numbers are slightly
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  rounded to account for numerical imprecision.
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  rounded to account for numerical imprecision.
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  Like \code{order}, for a classed \R object the grouping is based on
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  Like \code{order}, for a classed \R object the grouping is based on
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  the result of \code{\link{xtfrm}}.
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  the result of \code{\link{xtfrm}}.