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A general description is here.
‘source(file, echo=TRUE)’ could fail if the file contained ‘#line’ directives. It now recovers more gracefully, but may still display the wrong line if the directive gives incorrect information.
‘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.