#' @return
#' * Data Frame
#' + default: a [tibble::tibble()] if `as_tibble` is `TRUE` and `{tibble}` is installed.
#' + alternative: a [data.table::data.table()]
#' * If `split` is `TRUE` and `summarize` is `FALSE`, the result will be a `list()` of
#' data frames.
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