is
When formatting a Hebrew Year, traditionally years ending in 20, 40, 50, 80 and 90 are formatted using non-final form letters for example תש״פ for the year 5780. Setting this to true (the default is false) will use the final form letters for מנצפ״ך and will format the year 5780 as תש״ף.
Set this to true to use final form letters when formatting Hebrew years.