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  not respect the locale and always sort in numerical order of the bytes
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  not respect the locale and always sort in numerical order of the bytes
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  in an 8-bit locale, or in Unicode point order for a UTF-8 locale (and
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  in an 8-bit locale, or in Unicode point order for a UTF-8 locale (and
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  may not sort in the same order for the same language in different
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  may not sort in the same order for the same language in different
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  character sets).  Collation of non-letters (spaces, punctuation signs,
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  character sets).  Collation of non-letters (spaces, punctuation signs,
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  hyphens, fractions and so on) is even more problematic.
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  hyphens, fractions and so on) is even more problematic.
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  Character strings can be compared  with different marked encodings
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  Character strings can be compared  with different marked encodings
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  (see \code{\link{Encoding}}): they are translated to UTF-8 before
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  (see \code{\link{Encoding}}): they are translated to UTF-8 before
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  comparison.
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  comparison.
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  At least one of \code{x} and \code{y} must be an atomic vector, but if
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  At least one of \code{x} and \code{y} must be an atomic vector, but if
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  Missing values (\code{\link{NA}}) and \code{\link{NaN}} values are
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  Missing values (\code{\link{NA}}) and \code{\link{NaN}} values are
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  regarded as non-comparable even to themselves, so comparisons
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  regarded as non-comparable even to themselves, so comparisons
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  involving them will always result in \code{NA}.  Missing values can
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  involving them will always result in \code{NA}.  Missing values can
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  also result when character strings are compared and one is not valid
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  also result when character strings are compared and one is not valid
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  in the current collation locale.
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  in the current collation locale.
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  Language objects such as symbols and calls are deparsed to
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  Language objects such as symbols and calls are deparsed to
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  character strings before comparison.
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  character strings before comparison.
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}
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}
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\value{
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\value{
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  influential.  Where available \R makes use of ICU
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  influential.  Where available \R makes use of ICU
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  (\url{http://site.icu-project.org/} for collation.
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  (\url{http://site.icu-project.org/} for collation.
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}
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}
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\seealso{
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\seealso{
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  \code{\link{factor}} for the behaviour with factor arguments.
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  \code{\link{factor}} for the behaviour with factor arguments.
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  \code{\link{Syntax}} for operator precedence.
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  \code{\link{Syntax}} for operator precedence.
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  \code{\link{icuSetCollate}} to tune the string collation algorithm
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  \code{\link{icuSetCollate}} to tune the string collation algorithm
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  when ICU is in use.
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  when ICU is in use.
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}
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}