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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 vectors, with ‘polar’ determining if polar or cartesian coordinates are more relevant; mostly based on a proposal by Mikael Jagan. Experimentally, and to be changed before release, ‘summary(<raw>)’ also provides quantitative information.
A new ‘LIBR_LDFLAGS’ defaulting to ‘LDFLAGS’ allows more flexibility, e.g., for distributions such as Gentoo, Debian or Ubuntu, fixing PR#18992; additionally a ‘make’ failure to create ‘libR.pc’ should no longer be ignored, fixing PR#18993; both thanks to Benjamin Drung.
‘format(r)’ now keeps ‘names(r)’ also for raw objects ‘r’.