mode <- function(x) {
    if(is.expression(x)) return("expression")
    if(is.call(x))
	return(switch(deparse(x[[1]])[1],
		      "(" = "(",
		      ## otherwise
		      "call"))
    if(is.name(x)) "name" else
    switch(tx <- typeof(x),
	   double=, integer= "numeric",# 'real=' dropped, 2000/Jan/14
	   closure=, builtin=, special= "function",
	   ## otherwise
	   tx)
}
"storage.mode<-" <-
"mode<-" <- function(x, value)
{
    if (storage.mode(x)==value) return(x)
    mde <- paste("as.",value,sep="")
    atr <- attributes(x)
    x <- eval(call(mde,x), parent.frame())
    attributes(x) <- atr
    attr(x, "Csingle") <- if(value == "single") TRUE # else NULL
    x
}
storage.mode <- function(x) {
    x <- typeof(x)
    if (x == "closure" || x == "builtin" || x == "special") return("function")
    x
}