code: function AssertionError( message , from , options = {} ) {
  	this.message = message ;
  
  	from = from || AssertionError ;
  
  	// This will make Mocha and Tea-Time show the diff:
  	this.actual = options.actual ;
  	this.expected = options.expected ;
  	this.expectationType = options.expectationType ;
  	this.showDiff = !! options.showDiff ;
  
  	if ( Error.captureStackTrace ) { Error.captureStackTrace( this , from ) ; }
  	else { Object.defineProperty( this , 'stack' , { value: Error().stack , enumerable: true , configurable: true } ) ; }
  }
docs: function AssertionError( message , from , actual , expected , showDiff ) {