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A general description is here.
‘Sys.setLanguage()’ now works in an ‘LC_ALL=C R’ session on some
platforms, warns about _some_ failures to change the language and gets
an option related to these warning messages.
‘Sys.setLanguage()’ now warns about _some_ failures to change the language.
Setting ‘attributes’ on primitive functions is deprecated now and already an error in the development version of R. Changing the ‘environment’ of a primitive does no longer happen and signals a warning.