static float floatSum(Iterable<Float> l) {
  float sum = 0;
  for (Float i : unnull(l))
    if (i != null) sum += i;
  ret sum;
}

static float floatSum(float... l) {
  float sum = 0;
  if (l != null) for (float i : l)
    sum += i;
  ret sum;
}

Began life as a copy of #1019131