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A general description is here.
‘summaryRprof()’ returns zero-row data frames rather than tnrow an error if no events are recorded, for consistency.
The default for ‘TAR’ on Windows for ‘R CMD build’ has been changed to be ‘internal’ if no ‘tar’ command is on the path.
This enables most packages to be built ‘out of the box’ without ‘Rtools’: the main exceptions are those which need to be installed to re-build vignettes and need ‘Rtools’ for installation (usually because they contain compiled code).