#' @param sparse A logical scalar (defaulting to \code{FALSE}) indicating
#' whether to use a sparse representation of the design (X) matrix.
#' If \code{TRUE}, the the design matrix is not centered (since that would
#' destroy the sparsity) and likewise it is not possible to specify both
#' \code{QR = TRUE} and \code{sparse = TRUE}. Depending on how many zeros
#' there are in the design matrix, setting \code{sparse = TRUE} may make
#' the code run faster and can consume much less RAM.
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