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  type: like \code{\link{as.vector}} it strips attributes including
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  type: like \code{\link{as.vector}} it strips attributes including
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  names.
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  names.
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  Since \R version 4.4.0, \code{as.complex(x)} for \dQuote{number-like}
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  Since \R version 4.4.0, \code{as.complex(x)} for \dQuote{number-like}
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  \code{x}, i.e., types \code{"logical"}, \code{"integer"}, and
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  \code{x}, i.e., types \code{"logical"}, \code{"integer"}, and
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  \code{"double"}, will always keep imaginary part zero, now also for
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  \code{"double"}, will always keep imaginary part zero, now also for
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  \code{NA}'s.
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  \code{NA}s.
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    Up to \R versions 3.2.x, all forms of \code{NA} and \code{NaN}
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    Up to \R versions 3.2.x, all forms of \code{NA} and \code{NaN}
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  were coerced to a complex \code{NA}, i.e., the \code{\link{NA_complex_}}
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  were coerced to a complex \code{NA}, i.e., the \code{\link{NA_complex_}}
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  constant, for which both the real and imaginary parts are \code{NA}.
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  constant, for which both the real and imaginary parts are \code{NA}.
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  Since \R 3.3.0, typically only objects which are \code{NA} in parts
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  Since \R 3.3.0, typically only objects which are \code{NA} in parts
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  are coerced to complex \code{NA}, but others with \code{NaN} parts,
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  are coerced to complex \code{NA}, but others with \code{NaN} parts,
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  are \emph{not}.  As a consequence, complex arithmetic where only
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  are \emph{not}.  As a consequence, complex arithmetic where only
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  \code{NaN}'s (but no \code{NA}'s) are involved typically will
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  \code{NaN}s (but no \code{NA}s) are involved typically will
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  \emph{not} give complex \code{NA} but complex numbers with real or
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  \emph{not} give complex \code{NA} but complex numbers with real or
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  imaginary parts of \code{NaN}.
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  imaginary parts of \code{NaN}.
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  All of these many different complex numbers fulfill \code{is.na(.)} but
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  All of these many different complex numbers fulfill \code{is.na(.)} but
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  only one of them is identical to \code{NA_complex_}.
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  only one of them is identical to \code{NA_complex_}.
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