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#' @param repos `character()`\cr
#' A vector of repositories to query. The following values are available:
#' * `"cran"`, meaning CRAN;
#' * `"bioc@release"`, meaning Bioconductor, where `release` should be replaced
#' with a valid Bioconductor release code or one of `"release"`, `"devel"`;
#' * `"github/user"`, meaning GitHub, where `user` should be replaced with a
#' valid user or organization name (e.g. `turtletopia`);
#' * `"runiverse@universe"`, meaning R-universe, where `universe` should be
#' replaced with a valid universe name (e.g. `turtletopia`);
#' * `"local#index"`, meaning a local library, where `index` should be replaced
#' with an integer index of a library in [base::.libPaths()] or an `all`
#' keyword;
#' * `"core"`, meaning base R packages;
#' * a URL if none of the above is matched.
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