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A general description is here.
The vignette indices are more comprehensive (in the style of ‘browseVignetttes()’).
R's internal filename completion now properly handles filenames with spaces in them even when the readline library is used. This resolves PR#14452 provided the internal filename completion is used (e.g., by setting ‘rc.settings(files = TRUE)’).
The environment variable ‘R_HOME’ in an R session now uses slash as the path separator (as it always has when set by ‘Rcmd.exe’).