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A general description is here.
The ‘xtfrm()’ method for class ‘"AsIs"’ is now considerably faster thanks to a patch provided by Ivan Krylov.
The ‘merge()’ method for data frames will no longer convert row names used for indexing using ‘I()’, which will lead to faster execution in cases where ‘sort = TRUE’ and ‘all.x’ and/or ‘all.y’ are set to ‘TRUE’.
On macOS in R CRAN builds, it is again possible to read little-endian UTF-16 text with a BOM from a connection using ‘encoding="UTF-16"’. Users building R from source should avoid using the system ‘libiconv’ in macOS 14.1 and later.