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‘na.contiguous(x)’ now also returns the first run, when it is at the beginning and there is a later one of the same length; reported to R-devel, including a fix, by Georgi Boshnakov. Further, by default, it modifies only an existing ‘attr(*,"tsp")’ but otherwise no longer sets one.
‘chol(<not pos.def>, pivot = <T|F>)’ now gives a correct error or warning message (depending on ‘pivot’), thanks to Mikael Jagan's (PR#18541).
‘.S3methods()’, typically called from ‘methods()’, again marks methods from package ‘base’ as ‘visible’.
Also, the visibility of non-‘base’ methods is again determined by the method's presence in ‘search()’.