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A general description is here.
‘citation()’ supports inst/CITATION files from package source trees, with ‘lib.loc’ pointing to the directory containing the package.
In integer arithmetic, ‘NULL’ is now treated as ‘integer(0)’ where it was ‘double(0)’, previously.
‘abbreviate()’ gets option ‘named = TRUE’.
‘mccollect()’ now returns a named list (as documented) called with ‘wait=FALSE’. (Reported by Michel Lang.)