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A general description is here.
The ‘"Built"’ column returned by ‘installed.packages()’ and ‘old.packages()’ now contains the full value of the ‘"Built"’ entry from the (installed) ‘DESCRIPTION’ file. Previously, only the R version from the ‘"Built"’ entry was returned.
If the timestamp passed as ‘--built-timestamp’ to ‘R CMD INSTALL’ is in RFC-2822 form (with time-zone offset) it will be converted to ISO UTC form to conform to the format used by R for purposes described above. (PR#19037, thanks to Dirk Eddelbuettel)
When ‘Ops’ group methods for matrix-‘"ts"’ return a zero-extent matrix, its type is correct now. E.g., ‘<int> + <dbl>’ now returns type ‘"double"’, see also PR#18972.
