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A general description is here.
‘grDevices::glyphInfo()’ gains a ‘rot’ argument to allow per-glyph rotation. (Thanks to Daniel Sabanes Bove.)
Many arguments which should be length-1 logical are checked more thoroughly. The most commonly seen errors are in ‘unlink(, recursive)’, ‘tempdir()’ and the ‘na.rm’ argument of ‘max()’, ‘min()’, ‘sum()’, ....
‘grep()’, ‘strsplit()’ and similar took non-‘TRUE’ values of their logical arguments as ‘FALSE’, but these were almost always mistakes and are now reported as ‘NA’.