anchor.diff:      }
     }
   
  -  static Date parse( final DateFormat formatter, final String source )
  +  @javax.annotation.Nonnull
  +  static Date parse( @javax.annotation.Nonnull final DateFormat formatter, @javax.annotation.Nonnull final String source )
       throws IOException
     {
       try
  
positive.code:     extends JsonSerializer<List<Date>>
    {
      @Override
      public void serialize( final List<Date> dates,
                             final JsonGenerator generator,
                             final SerializerProvider provider )
        throws IOException
      {
        generator.writeStartArray();
  
negative.code:     extends JsonSerializer<Date>
    {
      @Override
      public void serialize( @javax.annotation.Nonnull final Date date,
                             @javax.annotation.Nonnull final JsonGenerator generator,
                             @javax.annotation.Nonnull final SerializerProvider provider )
        throws IOException
      {
        generator.writeString( newDateFormatter().format( date ) );
  