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‘seq.int(from, to, by, ....)’ when |by| = 1 now behaves as if ‘by’ was omitted, and hence returns ‘from:to’, possibly integer.
‘seq.Date(from, to, by, ....)’ and ‘seq.POSIXt(..)’ now also work when ‘from’ is missing and sufficient further arguments are provided, thanks to Michael Chirico's report, patch proposal in PR#17672 and ‘R Dev Day’ contributions.
The ‘Date’ method also works for ‘seq(from, to)’, when ‘by’ is missing and now defaults to ‘"1 days"’.