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A general description is here.
‘sys.source()’ did not report error locations when ‘keep.source = TRUE’.
In the ‘DESCRIPTION’ file,
License: X11
is no longer recognized as valid, since it includes ‘Copyright (C) 1996 X Consortium’ which cannot be appropriate for a current R package. Use ‘MIT’ or ‘BSD_2_clause’ instead.
‘tools::Rdiff(useDiff = FALSE)’ is closer to the POSIX definition of ‘diff -b’ (as distinct from the description in the ‘man’ pages of most systems).
In a package's ‘DESCRIPTION’ file,
License: X11
is deprecated, since it includes ‘Copyright (C) 1996 X Consortium’ which cannot be appropriate for a current R package. Use ‘MIT’ or ‘BSD_2_clause’ instead.
R help pages and manuals have no ISBNs because ISBN rules no longer allow constantly changing content to be assigned an ISBN.