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A general description is here.
‘SEXP’ type ‘S4SXP’ has been renamed ‘OBJSXP’ to support experimenting with alternative object systems. The ‘S4SXP’ value can still be used in ‘C’ code but is now deprecated. Based on contriubtions from the R Consortium Object-Oriented Programming Working Group.
Some invalid ‘file’ arguments to ‘pictex()’, ‘postscript()’ and
‘xfig()’ opened a file called ‘NA’ rather than throw an error. These
included ‘postscript(NULL)’ (which some people expected to work like
‘pdf(NULL)’).
Passing ‘filename = NA’ to ‘svg()’, ‘cairo_pdf()’, ‘cairo_ps()’ or the Cairo-based bitmap devices opened a file called ‘NA’: it now throws an error.
‘quartz(file = NA)’ opened a file called ‘NA’, including when used as a Quartz-based bitmap device. It now gives an error.
‘rank(<long vector>)’ now works, fixing PR#18617, thanks to Ilia Kats.
Some invalid ‘file’ arguments to ‘pictex()’, ‘postscript()’ and ‘xfig()’ opened a file called ‘NA’ rather than throw an error. These included ‘postscript(NULL)’ (which some people expected to work like ‘pdf(NULL)’).
Passing ‘filename = NA’ to ‘svg()’, ‘cairo_pdf()’, ‘cairo_ps()’ or the Cairo-based bitmap devices opened a file called ‘NA’: it now throws an error.
‘quartz(file = NA)’ opened a file called ‘NA’, including when used as a Quartz-based bitmap device. It now gives an error.
‘rank(<long vector>)’ now works, fixing PR#18617, thanks to Ilia Kats.
‘match(<POSIXct>, .)’ is correct again for differing time zones, ditto for ‘"POSIXlt"’, fixing PR#18618 reported by Bastian Klein.