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‘merge.data.frame’ now returns the correct column names when at least one of the merged data frames has zero rows and at least one of the merged data frames has only one column, fixing PR#18930. Thanks to David Molnar and Gabriel Becker.
Fix long standing (fortran compiler optimization related) bug in ‘nlminb’ with constraints, thanks to Kasper Kristensen's PR#19086 report and patch.
