code: public Yasson doWith(final Consumer<JsonbConfig> configurer) {
      requireNonNull(configurer, "Configurer callback is required.");
      this.configurer = (jsonConfig, conf) -> configurer.accept(jsonConfig);
      return this;
    }
docs: Configurer callback.
  
  <pre>
  {
  use(new Yasson().doWith((builder, config) {@literal ->} {
  builder.withFormatting(true);
  // ...
  });
  }
  </pre>
  
  @param configurer A callback.
  @return This instance.