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A general description is here.
Condition classes used internally for signaling some errors are now documented in ‘?conditions’.
For ‘x <- <large-POSIXlt>’, ‘c(x)’, subsetting (‘[’, ‘[[’) and subassignment such as ‘x[i] <- val’ now work again mostly, thanks to suggestions by Suharto Anggono in PR#18989.
When subassigning ‘"POSIXlt"’, e.g., ‘<dat>[i] <- v’, ‘v’ is now converted to the time zone of ‘dat’, before being assigned, see PR#18919.