This blog is updated daily.
A general description is here.
‘memDecompress(type = "unknown")’ recognizes compression in the defailt ‘zlib’ format as used by ‘memCompress(type = "gzip")’.
‘memCompress()’ and ‘memDecompress()’ will use the ‘libdeflate’ library (<URL: https://github.com/ebiggers/libdeflate>) if installed. This uses the same type of compression for ‘type = "gzip"’ but is 1.5-2x faster than the system ‘libz’ library on some common platforms: the speed-up may depend on the library version.