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A general description is here.
‘findMethod’ failed if the active signature had expanded beyond what a particular package used. (Example with packages ‘XR’ and ‘XRJulia’ on CRAN).
Bandwidth selectors ‘bw.ucv()’ and ‘bw.SJ()’ gave incorrect answers or incorrectly reported an error (because of integer overflow) for inputs longer than 46341. Similarly for ‘bw.bcv()’ at length 5793.
Another possible integer overflow is checked and may result in an error report (rather than an incorrect result) for much longer inputs (millions for a smooth distribution).