https://r-lib.r-universe.dev/pkgcachehttps://r-lib.r-universe.dev/api/packages/pkgcachehttps://r-lib.r-universe.dev/pkgcache/pkgcache.pdfhttps://r-lib.r-universe.dev/pkgcache/doc/manual.htmlhttps://r-lib.r-universe.dev/pkgcache/NEWShttps://r-lib.r-universe.dev/pkgcache/NEWS.txthttps://r-lib.r-universe.dev/pkgcache/citationhttps://r-lib.r-universe.dev/pkgcache/citation.txthttps://r-lib.r-universe.dev/pkgcache/citation.cff