code: public static DecomposableMatchBuilder1<Double, Double> caseDouble(MatchesAny d) {
      List<Matcher<Object>> matchers = new ArrayList<>();
      matchers.add(any());
  
      return new DecomposableMatchBuilder1<>(
          matchers, 0, new PrimitiveFieldExtractor<>(Double.class));
    }
docs: Matches a double.
  
  <p>If matched, the double value is extracted.