Get TypeError: cb is not a function

[datapresso]

We are using connect-rest via express. We are not using connect directly and we noticed that the error cited in this issue title when we try to callback.

If we try to have "cb" below and it is always undefined and subsequent cb calls will result in the "cb is not a function".

	async function service( request, content, cb ){
	    console.log( 'Received headers:' + JSON.stringify( request.headers ) )
	    console.log( 'Received parameters:' + JSON.stringify( request.parameters ) )
	    console.log( 'Received JSON object:' + JSON.stringify( content ) )
	    console.log( 'cb:' + JSON.stringify(cb) )
	    return 'ok'
	}
	rest.get( [ { path: '/shake', version: '>=2.0.0' }, { path: '/twist', version: '>=2.1.1' } ], service )