#' @param fmatch [\code{logical(1)}]\cr
#' Use the set operations implemented in \code{\link[fastmatch]{fmatch}} in package \pkg{fastmatch}.
#' If \pkg{fastmatch} is not installed, this silently falls back to \code{\link[base]{match}}.
#' \code{\link[fastmatch]{fmatch}} modifies \code{y} by reference:
#' A hash table is added as attribute which is used in subsequent calls.
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