android/guava/src/com/google/common/primitives/Floats.java
private static int lastIndexOf(float[] array, float target, int start, int end) {
    for (int i = end - 1; i >= start; i--) {
      if (array[i] == target) {
        return i;
      }
    }
    return -1;
  }
private static int lastIndexOf(float[] array, float target, int start, int end) {
    for (int i = end - 1; i >= start; i--) {
      if (array[i] == target) {
        return i;
      }
    }
    return -1;
  }
TODO(kevinb): consider making this public