[Rd] File permissions test during R CMD check

[David Kane <David Kane]

I think that I understand why R CMD check should warn if the permissions on a
file are too restrictive, but I don't understand why it should warn if they are
"too" loose. On UNIX, why is a file with 644 OK, but one with 664 (just adding
group writability) problematic enough to require a warning?

Thanks,

Dave Kane
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