text: -- file:float8.sql ln:209 expect:true
  SELECT x, y,
         atan2d(y, x),
         atan2d(y, x) IN (-90,0,90,180) AS atan2d_exact
  FROM (SELECT 10*cosd(a), 10*sind(a)
        FROM generate_series(0, 360, 90) AS t(a)) AS t(x,y)
  