#' @param dict_entry (`character(1)` | `NULL`)\cr
#' Key of the class inside the [`Dictionary`][mlr3misc::Dictionary] (usually one of
#' [`dict_mutators`], [`dict_recombinators`], [`dict_selectors`]), where it can
#' be retrieved using a [short access function][mut]. May be `NULL` if the operator
#' is not entered in a dictionary.\cr
#' The `$dict_entry` field will reflect this value.
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