code: public JBBPTextWriter DelExtras(final Extra... extras) {
      JBBPUtils.assertNotNull(extras, "Extras must not be null");
      for (final Extra e : extras) {
        JBBPUtils.assertNotNull(e, "Extras must not be null");
        this.extras.remove(e);
      }
      return this;
    }
docs: Remove extras from context
  
  @param extras extras to be removed, must not be null
  @return the context