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  Thus, for \R < 4.5.0, the set operands were always transformed via
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  Thus, for \R < 4.5.0, the set operands were always transformed via
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  \code{\link{as.vector}()} (so that in particular, factors were coerced
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  \code{\link{as.vector}()} (so that in particular, factors were coerced
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  to character vectors).  Starting with \R 4.5.0, operands of the
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  to character vectors).  Starting with \R 4.5.0, operands of the
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  \dQuote{same kind} (in the sense that \code{\link{isa}(x, class(y))}
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  \dQuote{same kind} (in the sense that \code{\link{isa}(x, class(y))}
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  or \code{\link{isa}(y, class(x))} which appear to be
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  or \code{\link{isa}(y, class(x))} which appear to be
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  \dQuote{vector-like} (in the sense that subscripting \code{x} and/or
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  \dQuote{vector-like} (in the sense that \code{dim(x)} has length at
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  most one, and subscripting \code{x} and/or
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  \code{y} by \code{0L} leaves the class unchanged) are no longer
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  \code{y} by \code{0L} leaves the class unchanged) are no longer
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  transformed.   In particular, union, intersection and set difference
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  transformed.   In particular, union, intersection and set difference
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  of two factors now give factors (see the examples).
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  of two factors now give factors (see the examples).
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  \code{is.element(x, y)} is identical to \code{x \%in\% y} (after
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  \code{is.element(x, y)} is identical to \code{x \%in\% y} (after