Boolean array showing which stars pass all count constraints.

        A "count constraint" is a constraint that affects the number of stars.

def countok(self):
        """
        Boolean array showing which stars pass all count constraints.

        A "count constraint" is a constraint that affects the number of stars.
        """
        ok = np.ones(len(self.stars)).astype(bool)
        for name in self.constraints:
            c = self.constraints[name]
            if c.name not in self.selectfrac_skip:
                ok &= c.ok
        return ok