static <A extends Concept> A nuLike findConceptWhereCI(Class<A> c, O... params) {

  ret findConceptWhereCI(db_mainConcepts(), c, params);

}

static <A extends Concept> A findConceptWhereCI(Concepts concepts, Class<A> c, O... params) {

  params = expandParams(c, params);

  // indexed

  if (concepts.ciFieldIndices != null)

    for (int i = 0; i < l(params); i += 2) {

      IFieldIndex<A, O> index = concepts.getCIFieldIndex(c, (S) params[i]);

      if (index != null) {

        for (A x : index.getAll(params[i+1]))

          if (checkConceptFieldsIC(x, params)) ret x;

        null;

      }

    }

  // table scan

  for (A x : concepts.list(c)) if (checkConceptFieldsIC(x, params)) ret x;

  null;

}

static Concept findConceptWhereCI(Concepts concepts, S c, O... params) {

  for (Concept x : concepts.list(c)) if (checkConceptFieldsIC(x, params)) ret x;

  null;

}