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‘capabilities()’ now reports if ICU is used for collation.
Fixed an obscure bug in pairlist subassignment, reported by Radford Neal as part of pqR issue 16.
(Windows) There is updated support from the use of ICU for collation: see the ‘R Installation and Administration Manual’.
Compilers/linkers were handling the visibility controls in ‘src/extra/xz’ inconsistently (and apparently in some cases incorrectly), so it has been simplified. (PR#15327)