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export default function(values, valueof) {
  var n = values.length,
      i = -1,
      value,
      min,
      max;

  if (valueof == null) {
    while (++i < n) { // Find the first comparable value.
      if ((value = values[i]) != null && value >= value) {
        min = max = value;
        while (++i < n) { // Compare the remaining values.
          if ((value = values[i]) != null) {
            if (min > value) min = value;
            if (max < value) max = value;
          }
        }
      }
    }
  }

  else {
    while (++i < n) { // Find the first comparable value.
      if ((value = valueof(values[i], i, values)) != null && value >= value) {
        min = max = value;
        while (++i < n) { // Compare the remaining values.
          if ((value = valueof(values[i], i, values)) != null) {
            if (min > value) min = value;
            if (max < value) max = value;
          }
        }
      }
    }
  }

  return [min, max];
}