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A general description is here.
‘memDecompress()’ supports the RFC 1652 format (e.g. in-memory copies of ‘gzip’-compressed files) as well as RFC 1650.
‘memCompress()’ and ‘memDecompress()’ support long raw vectors for types ‘"gzip"’ and ‘"zx"’.
‘print()’'s default method and many other methods (by calling the default eventually and passing ‘...’) now make use of a new optional ‘width’ argument, avoiding the need for the user to set and reset options("width").