#' @import methods
#' @import tidyr
#' @import tibble
NULL
#' @export
dummyFunction <- function() 1
#' tbl_df
#'
#' @name tbl_df-class
#' @exportClass tbl_df
setOldClass(c("tbl_df", "tbl", "data.frame"))
#' @export
setClass("S4DataFrame", contains = c("tbl_df"))
#' @export
mean.tbl_df <- function(x) x
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