private static int indexOf(Object[] array, Object toFind) {
    for (int i = 0; i < array.length; i++) {
      if (toFind.equals(array[i])) {
        return i;
      }
    }
    throw new NoSuchElementException();
  }
Returns the generic supertype for {@code supertype}. For example, given a class {@code
IntegerSet}, the result for when supertype is {@code Set.class} is {@code Set<Integer>} and the
result when the supertype is {@code Collection.class} is {@code Collection<Integer>}.
core/src/main/java/feign/Types.java