the first use of extrapolation in a session.  (As all time zones

post 2037 are extrapolation, we do not warn on those.)

Windows and by default macOS). How years are printed in dates or

date-times can be controlled by environment variable

.  The default remains to pad to 4 digits

tries harder to determine the offset for

produced -- attempting to exceed this is an error.  (Previously it

system time zone as part of the locale information.  Also, the

source (system/internal) of the date-time conversion and printing

set on the (almost all) platforms which have C-level support,

There are comprehensive validity checks on the structure of

formatting and printing).  (This avoids mis-conversions of

There is some support for using the native date-time

routines on macOS: this is only viable on recent versions

12.6 and 13) and does get wrong some historical changes

and improved by Michael Chirico and Joshua Ulrich in

correctly, e.g., in subsetting and subassignments.  Such objects

indicating if it is known to be filled or fully

rewritten to gain better default tick locations and better default

The mapping of Windows' names for time zones to IANA's

names has been updated.  When ICU is available (it is

by default), it is used to get a mapping for the current region set in

Windows.  This can be overridden by setting environment variable

and so packages that provide graphics devices

functions for rendering typeset glyphs, primarily:

Rendering of typeset glyphs is only supported so far on the

simple interpretation of original Porter-Duff definitions).

Support for gradients, patterns, clipping paths, masks,

groups, compositing operators, and affine transformations has

A system installation of generic LAPACK 3.10.0 or later will

is looked for and used if it reports version

3.10.0 or later and does not contain BLAS routines.

Packages using LAPACK will need to be reinstalled if this changes

(which has been seen on platforms missing

the default and ignored (with a warning).  It is highly

recommended that the system headers are installed alongside