rb_num2ushort     678 include/ruby/ruby.h unsigned short rb_num2ushort(VALUE);
rb_num2ushort     693 include/ruby/ruby.h #define RB_NUM2USHORT(x) rb_num2ushort(x)
rb_num2ushort    2743 numeric.c      	return rb_num2ushort(val);