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A general description is here.
‘identical()’ gets an ‘ignore.srcref’ option which drops ‘"srcref"’ and similar attributes when true (as by default).
‘diag(x, n=.)’ now preserves ‘typeof(x)’, also for logical, integer and raw ‘x’ (and as previously for complex and numeric).
The API for readline libraries >= 6.3 had changed such terminal window resizes where no longer properly signalled (PR#16604). Also, ‘Ctrl C’ in incremental search behaved confusingly in R (unix) consoles (PR#16603) also for older readline versions. These have been fixed (for readline >= 6.3 only), thanks to patches by Frederick Eaton.
The API for readline libraries >= 6.3 had changed such that incremental
search and line editing after terminal resizing behaved confusingly in
R (unix) consoles. This has been fixed thanks to patches by Frederick
Eaton in PR#16603 and PR#16604.