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A general description is here.
‘rep()’, ‘seq()’, ‘seq.int()’ and ‘seq_len()’ report more often when the first element of an incorrect length argument is taken.
The Cocoa back-end for the ‘quartz()’ graphics device on Mac OS X provides a way to disable event loop processing temporarily (useful, e.g., for forked instances of R).
Zip-ing data sets in packages (and hence ‘R CMD INSTALL --use-zip-data’ and the ‘ZipData: yes’ field in a ‘DESCRIPTION’ file) is deprecated: using efficiently compressed ‘.rda’ images and lazy-loading of data has superseded it.
‘R CMD INSTALL’ was not always respecting the ‘ZipData: yes’ field of a ‘DESCRIPTION’ file (although this is frequently incorrectly specified for packages with no data or which specify lazy-loading of data).
‘R CMD INSTALL --use-zip-data’ was incorrectly implemented as ‘--use-zipdata’ since R 2.9.0.