Is there a general principle for how we treat a י"א = יש אומרים (yesh omrim, "some say") cited in the Shulchan Aruch (or Rama) for the purposes of determining halacha? If not, are there examples of two halachos where we use different approaches towards a י"א (e.g. following one but not the other, treating one as going l'chumra and one as going l'kula, etc.)?