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A general description is here.
‘str(x)’ gets a new ‘deparse.lines’ option with a default to speed it up when ‘x’ is a large ‘call’ object.
The internal traceback object produced when an error is signalled (‘.Traceback’), now contains the ‘call’s rather than the _‘deparse()’d_ calls, deferring the deparsing to the user level functions ‘.traceback()’ and ‘traceback()’, fulfilling the whish of PR#17580, reported (incl. patch proposal) by Brodie Gaslam.