reproducible example and patch by Sebastian Meyer in

on the formula to work correctly for models with extended formulas.

The horizontal position of leaves in a dendrogram is now

describes the difference in its return value (

are now computed more carefully and symmetrically in their range,

.  The change really corresponds to an improved

to at least five digits where it was catastrophically wrong,

-group member functions now work for data frames

and relatives treated an "NA" column name as

Parsing strings containing UTF-16 surrogate pairs such as

works better on some (uncommon) platforms.

necessarily fail, as currently for different

Message translation domains, e.g., for errors and warnings, are

now correctly determined also when e.g., a

Too long lines in environment files (e.g.,

. This limit has been increased to 100,000 bytes.

file for new content.  (Thanks to a report and patch by Sebastian

(which is UTF-8) had been broken by a macOS

change: fortunately these are now rarely used with

(Thanks to a report and patch by Nicolas Bennett in

options in an Rd file, had been ineffective since

(Thanks to a report and patch by Sebastian Meyer in

and other functions for evaluating (extended)

regular expressions handle in Unicode also strings not explicitly

flagged UTF-8, but flagged native when running in UTF-8 locale.

has been reverted: it contained some errors in

to work with LaTeX versions since Oct 2020.

Unicode character width tables (as used by

AIX) has been updated to include many recent Unicode

this is now a configuration error.  The previous behaviour was not

clear from the documentation: it was to continue the search as if

s in factors, thanks to Bill Dunlap and others in

and similar formula subsetting now works,

Additionally, subsetting leaving an empty formula now works too,

keeps source references again, as before

4.0.0, fixing a regression; introduced by the

for pairlists with list components, thanks to the report and patch

systems, from a report and patch suggestion by

argument names, notably in 1-argument calls; reported by Shane