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\item{incomparables}{a vector of values that cannot be compared.
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\code{FALSE} is a special value, meaning that all values can be
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compared, and may be the only value accepted for methods other than
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\item{fromLast}{logical indicating if duplication should be considered
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from the reverse side, i.e., the last (or rightmost) of identical
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elements would correspond to \code{duplicated=FALSE}.}