#' Common Parameters for gitr
#'
#' @name params
#'
#' @param n `integer(1)`. How far back to go from current `HEAD`.
#' Same as the command line `git log -n` parameter.
#' For `git stash` commands, zero-index into the stash list.
#'
#' @param file `character(1)`. The path to a file.
#'
#' @param branch `character(1)`. The name of a branch, typically a
#' feature branch.
#'
#' @param sha `character(n)`. The commit secure hash algorithm (SHA-1).
#' If `NULL`, typically points to the most recent commit on
#' the current branch.
#'
NULL
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