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A general description is here.
‘as.POSIXct(<numeric>)’ and ‘as.POSIXlt(.)’ (without specifying ‘origin’) now work.
The definition of ‘DL_FUNC’ in ‘R_ext/Rdynload.h’ has been changed to be fully C-compliant. This means that functions loaded _via_ for example ‘R_GetCCallable’ need to be cast to an appropriate type if they have any arguments.