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A general description is here.
‘R CMD check’ now runs sanity checks on the use of ‘LazyData’, for example that a ‘data’ directory is present and that ‘LazyDataCompression’ is not specified without ‘LazyData’. For packages with large LazyData databases without specifying ‘LazyDataCompression’, there is a reference to the code given in ‘Writing R Extensions’ §1.1.6 to test the choice of compression (as in all the CRAN packages tested a non-default method was preferred).
Time differences (‘"difftime"’ objects) get a replacement and a ‘rep()’ method to keep ‘"units"’ consistent. (Thanks to a report and patch by Nicolas Bennett in PR#18066.)