#' @param g1 [\code{\link{function}}]\cr
#' The gradient of the first objective in \code{ind}. If missing, it will
#' be approximated using \code{\link{estimateGradientBothDirections}}.
#' @param g2 [\code{\link{function}}]\cr
#' The gradient of the second objective in \code{ind}. If missing, it will
#' be approximated using \code{\link{estimateGradientBothDirections}}.
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