CHANGES IN R 4.4.1

C-LEVEL FACILITIES:

Functions R_atof and R_strtod declared in header R_ext/Utils.h
are now documented in 'Writing R Extensions' and so formally part
of the API.
The non-API entry points Rf_setSVector, Rf_StringFalse,
Rf_StringTrue and Rf_isBlankString have been added to those
reported by R CMD check.
The new function Rf_allocLang is now available. This provides an
alternative to the idiom of calling Rf_allocList followed by
SET_TYPEOF.

UTILITIES:

R CMD check now reports as warnings what gfortran calls 'Fortran
2018 deleted features', all of which have long been marked as
'obsolescent' and some of which were deleted in Fortran 2008 or
earlier. Fortran compilers are no longer required to support
these.

as.numeric(), scan(), type.convert() and other places which use
the internal C function R_strtod now require a non-empty digit
sequence in a decimal or binary exponent. This aligns with the
C/POSIX standard for strtod and with ?NumericConstants.
as.data.frame(m, make.names=NA) now works correctly for a matrix
m with NA's in row names.
The error message from <POSIXlt>[["hour"]] and similar now
mentions *[[, "hour"]], as wished for in [PR#17409](https://bugs.r-project.or\
g/show_bug.cgi?id=17409) and proposed by
Michael Chirico.
qbinom() and potentially qpois(), qnbinom(), no longer sometimes
fail accurate inversion (of pbinom(), etc), thanks to Christopher
Chang's report and patch in [PR#18711](https://bugs.r-project.org/show_bug.cg\
i?id=18711).
The internal help server on Windows can again serve requests sent
in quick succession, fixing a regression in R 4.4.0.
debugcall(<S3Generic>()) now also works when a corresponding
S4-generic version is in the methods cache ([PR#18143](https://bugs.r-project\
.org/show_bug.cgi?id=18143)).
Package tools' toTitleCase(ch0) now returns character(0) when ch0
is of zero length; fixing [PR#18724](https://bugs.r-project.org/show_bug.cgi?\
id=18724), reported by David Hugh Jones.
R CMD check is no longer broken (without a check result and no
explanation in 00check.log) for a package which declares an
invalid VignetteBuilder in DESCRIPTION but has no vignettes.