code: function get_args( args, fn_curr, fn_prev ) {
  		if ( args.length && OP.toString.call( args[0] ) === '[object Arguments]' ) {
  			if ( args.length < 2 && arguments.length > 1 ) {
  				if ( fn_curr in internal_method_names )
  					return get_args( args[0] );
  				if ( fn_prev && fn_curr === fn_prev )
  					return args[0];
  			}
  		}
  		return args;
  	}
docs: Class instance method helpers