#' @section Output:
#' The most unambiguous behaviour is achieved when \code{.fun} returns a
#' data frame - in that case pieces will be combined with
#' \code{\link{rbind.fill}}. If \code{.fun} returns an atomic vector of
#' fixed length, it will be \code{rbind}ed together and converted to a data
#' frame. Any other values will result in an error.
#'
#' If there are no results, then this function will return a data
#' frame with zero rows and columns (\code{data.frame()}).
#'
#' @return A data frame, as described in the output section.
#' @family data frame output
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