#' Function to return all values in a raster object.
#'
#' @param ra A raster object.
#'
#' @author Stuart K. Grange
#'
#' @seealso \code{\link[raster]{values}}
#'
#' @return Numeric vector or numeric matrix.
#'
#' @examples
#'
#' # Load raster object
#' ra_example <- raster::raster(system.file("external/test.grd", package = "raster"))
#'
#' # Get values
#' ra_values(ra_example)
#'
#' # Get unique values and sort
#' sort(unique(ra_values(ra_example)))
#'
#' @export
ra_values <- function(ra) raster::values(ra)
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