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Many small changes to ease compilation (and suppress warnings) with LLVM ‘clang’ 15.
Have ‘is.finite()’, ‘is.infinite()’, and ‘is.nan()’ methods for ‘POSIXlt’ date-time objects.
Non-finite ‘POSIXlt’ now correctly coerce to ‘Date’ and ‘POSIXct’; following up on the extension to ‘format()’ them correctly.