rt__valid_weeknum_p 4105 ext/date/date_core.c 	    VALUE jd = rt__valid_weeknum_p(year, week, wday, INT2FIX(0), sg);
rt__valid_weeknum_p 4124 ext/date/date_core.c 	    VALUE jd = rt__valid_weeknum_p(year, week, wday, INT2FIX(1), sg);