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A general description is here.
‘attr(., "tsp") <- val’ now uses ‘getOption("ts.eps")’ instead of hardwired ‘1e-5’; consequently, ‘ts(.., ts.eps=*)’ now passes ‘ts.eps’ to the ‘"tsp"’ setting C code; both fixing a long-standing ‘FIXME’.
Tcl/Tk 9 can be used to build package ‘tcltk’: this has become the default in some Linux distributions.
‘as.vector()’ gains a ‘data.frame’ method which returns a simple named list, also clearing a long-standing ‘FIXME’ to enable ‘as.vector(<data.frame>, mode="list")’. This breaks code relying on ‘as.vector(<data.frame>)’ to return the unchanged data frame.