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A general description is here.
Deparsing involving calls to anonymous functions and formula expressions has been made closer to reversible by the addition of extra parentheses.
The ‘print’ method for objects of class ‘"table"’ now detects tables with 0-extents and prints the results as, e.g., ‘< table of extent 0 x 1 x 2 >’. (Wish of PR#15198.)
The port of socket clusters is chosen randomly: this should help to avoid clashes when two users of a multi-user machine try to create a cluster at the same time.
Expressions involving user defined operators were not always deparsed
faithfully (PR#15179), nor were those involving calls to anonymous
functions (the latter reported by Hadley Wickham).
Expressions involving user defined operators were not always deparsed faithfully (PR#15179).