#' @md
#' @details input tbls are grouped by `chrom` by default, and additional
#' groups can be added using [dplyr::group_by()]. For example,
#' grouping by `strand` will constrain analyses to the same strand. To
#' compare opposing strands across two tbls, strands on the `y` tbl can
#' first be inverted using [flip_strands()].
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