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A general description is here.
‘bug.report()’ now tries to extract an email address from a ‘BugReports’ field, and if there is none, from a ‘Contacts’ field.
‘R CMD check’ now checks any ‘BugReports’ field to be non-empty and a suitable single URL.
‘bug.report()’ did not do any validity checking on a package's ‘BugReports’ field. It now ignores an empty field, removes leading whitespace and only attempts to open ‘http://’ and ‘https://’ URLs, falling back to emailing the maintainer.
‘findMethod’ failed if the active signature had expanded beyond what a particular package used. (Example with packages XR and XRJulia on CRAN).