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A general description is here.
‘bw.SJ()’ and ‘density(*, bw="SJ")’ no longer fail because of integer
overflow for large sample size n (starting from n as small as 65536).
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 ‘b2.bcv()’ at length 5793.
Another possible integer overflow is checked and may result in a reported error (rather than an incorrect result) for much longer inputs (millions for a smooth distribution).