code: public static <T> DecomposableMatchBuilder0<Optional<T>> some(MatchesExact<T> t) {
      List<Matcher<Object>> matchers = Lists.of(ArgumentMatchers.eq(t.t));
      return new DecomposableMatchBuilder0<Optional<T>>(matchers, new OptionalFieldExtractor<>());
    }
docs: Matches a non-empty {@link Optional}.