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A general description is here.
‘abbreviate()’ has more support for multi-byte character sets - it no longer removes bytes within characters and knows about Latin vowels with accents. It is still only really suitable for (most) European languages, and still warns on non-ASCII input.
‘abbreviate(use.classes = FALSE)’ is now implemented, and that is more suitable for non-European languages.
‘match(x, table)’ is faster, sometimes by an order of magnitude, when ‘x’ is of length one, thanks to Haverty's PR#16491.