public String getRawType() {
    return TypeEncoder.encodeRaw(optionalType);
  }
Returns a string representing the raw type of this Optional. This will typically be just {@code
"Optional"}, but it might be {@code "OptionalInt"} or {@code "java.util.Optional"} for example.
value/src/main/java/com/google/auto/value/processor/Optionalish.java