This blog is updated daily.
A general description is here.
Licence headers for the RPC code in ‘src/extra/xdr’ have been updated to use the GPL-compatible licence published by Oracle America in 2010.
The makefiles and installer scripts for Windows have been tailored to \IRtools44, an update of the \IRtools43 toolchain. It is based on GCC 13 and newer versions of \IMinGW-W64, \Ibinutils and libraries (targeting 64-bit Intel CPUs). R-devel can no longer be built using \IRtools43 without changes.
\IRtools44 has experimental support for 64-bit ARM (\Iaarch64) CPUs via \ILLVM 17 toolchain using ‘lld’, ‘clang’/‘flang-new’ and \Ilibc++.
The twelve ‘as.data.frame.<class>()’ methods which were deprecated only via ‘_R_CHECK_AS_DATA_FRAME_EXPLICIT_METHOD_’ and in ‘R CMD check --as-cran’ are formally deprecated now in favour of calling ‘as.data.frame()’ or ‘as.data.frame.vector()’. The deprecation “check” now works also when ‘as.data.frame()’ is S4 generic thanks to \IIvan Krylov.