// returns number of changes
static int cset(Concept c, O... values) ctex {
  if (c == null) ret 0;
  warnIfOddCount(values = expandParams(c.getClass(), values));
  int changes = 0;
  for (int i = 0; i+1 < l(values); i += 2)
    if (_csetField(c, (S) values[i], values[i+1])) ++changes;
  ret changes;
}

static int cset(Iterable<? extends Concept> l, O... values) {
  int changes = 0;
  fOr (Concept c : l)
    changes += cset(c, values);
  ret changes;
}

static <A extends Concept> int cset(Concept.Ref<A> c, O... values) {
  ret cset(getVar(c), values);
}