code: function extras(src, js, options) {
  		if (options.superword) {
  			js = suber.pseudokeyword(
  				js,
  				getwords(options.superword, defaultoptions.superword),
  				getwords(options.classword, defaultoptions.classword)
  			);
  		}
  		return js;
  	}
docs: Apply source code extras:
  
  1. Replace pseudosuperkeyword with `proto.call(this)`
  @param {string} src
  @param {string} js
  @param {object} options