anchor.diff:        methods: GET,PUT,POST
   ----
   
  -In general, null YAML keys are not included in assembly of the configuration property name, allowing them to be used to
  +In general, `null` YAML keys are not included in assembly of the configuration property name, allowing them to be used to
   any level for disambiguating configuration keys.
   
   == More info on how to configure
  
positive.code:     public String message;
      public String suffix = "!";
      public Optional<String> name;
      public HiddenConfig hidden; <1>
  
      public static class HiddenConfig {
          public Integer prizeAmount;
          public List<String> recipients;
      }
  
negative.code: Having simple public non-final fields is valid as well.
  
  Furthermore, the configuration classes support nested object configuration. Suppose there was a need to have an extra layer
  of greeting configuration named `content` that would contain a few fields. This could be achieved like so:
  
  [source,java]
  ----
  