docs: 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