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  Exactly what matches what is to some extent a matter of definition.
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  Exactly what matches what is to some extent a matter of definition.
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  For all types, \code{NA} matches \code{NA} and no other value.
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  For all types, \code{NA} matches \code{NA} and no other value.
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  For real and complex values, \code{NaN} values are regarded
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  For real and complex values, \code{NaN} values are regarded
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  as matching any other \code{NaN} value, but not matching \code{NA}.
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  as matching any other \code{NaN} value, but not matching \code{NA}.
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  That \code{\%in\%} never returns \code{NA} makes it particularly
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  That \code{\%in\%} never returns \code{NA} makes it particularly
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  useful in \code{if} conditions.
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  useful in \code{if} conditions.
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  Character strings will be compared as byte sequences if any input is
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  Character strings will be compared as byte sequences if any input is
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  marked as \code{"bytes"}.
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  marked as \code{"bytes"}.