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A general description is here.
The default ‘summary()’ is more informative for character vectors, optionally resorting to the factor method via the new argument ‘character.method = "factor"’, e.g., when summarizing a data frame (PR#16750).
It also provides more useful summaries for complex and raw vectors, for the former with ‘polar’ determining if polar or cartesian coordinates are more relevant; mostly based on a proposal by Mikael Jagan.
Package ‘README.md’ files are now installed and featured in HTML help.
Asymmetric toeplitz, ‘toeplitz(x, r)’, is type consistent now, even when ‘r’ of length 0 or 1 is not used directly. Fixes PR#18996, thanks to Mikael Jagan's patch and test.