nothing to note (I hope) except:
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NOTE re run time for examples. I get these sporadically. If pain persists, I will need to remove the examples. CRAN servers and Win-builder seem to have adequate grunt to avoid this issue.
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Any functions relying on package 'installr' (which was originally created for Windows only and listed as Suggests), only try to make use of installr::foo() within sufficient OS checking if() statements and requireNamespace().
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Any use of the shell() command do so with OS conditioning and interactive mode protection