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A general description is here.
'Writing R Extensions' now stresses that the standard sections in '.Rd'
files (other than '\alias', '\keyword' and '\note') are intended to be
unique, and the conversion tools now drop duplicates with a warning.
The '.Rd' conversion tools also warn about an unrecognized type in a '\docType' section.
'ecdf()' objects now have a 'quantile()' method.
'format()' methods for date-time objects now attempt to make use of a '"tzone"' attribute with '"%Z"' and '"%z"' formats, but it is not always possible. (Wish of PR#14358.)
'Writing R Extensions' now stresses that the standard sections in '.Rd' files (other than '\alias', '\keyword' and '\note') are intended to be unique, and the conversion tools now drop duplicates with a warning.
The '.Rd' conversion tools also warn about an unrecognized type in a '\docType' section.
'ecdf()' objects now have a 'quantile()' method.
'format()' methods for date-time objects now attempt to make use of a '"tzone"' attribute with '"%Z"' and '"%z"' formats, but it is not always possible. (Wish of PR#14358.)
'unique()' and 'match()' are now faster on character vectors where all elements are in the global 'CHARSXP' cache and have unmarked encoding (ASCII). Thanks to Matthew Dowle for suggesting improvements to the way the hash code is generated in 'unique.c'.
'R CMD check' no longer supports configuration files containing Perl configuration variables: use the environment variables documented in 'R Internals' instead.