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A general description is here.
‘R CMD INSTALL’ has a new option ‘--no-byte-compile’ which will override a ‘ByteCompile’ field in the package's ‘DESCRIPTION’ file.
License ‘BSD’ is deprecated: use ‘BSD_3_clause’ or ‘BSD_2_clause’ instead.
License ‘X11’ is deprecated: use ‘MIT’ or ‘BSD_2_clause’ instead.
‘eval’ and ‘applyClosure’ qre now protected against package code supplying an invalid ‘rho’.