retryable = function (opts, task) {
    if (!task) {
        task = opts;
        opts = null;
    }
    return initialParams(function (args, callback) {
        function taskFn(cb) {
            task.apply(null, args.concat([cb]));
        }

        if (opts) retry(opts, taskFn, callback);else retry(taskFn, callback);
    });
}
A close relative of [`retry`]{@link module:ControlFlow.retry}.  This method wraps a task and makes it
retryable, rather than immediately calling it with retries.

@name retryable
@static
@memberOf module:ControlFlow
@method
@see [async.retry]{@link module:ControlFlow.retry}
@category Control Flow
@param {Object|number} [opts = {times: 5, interval: 0}| 5] - optional
options, exactly the same as from `retry`
@param {Function} task - the asynchronous function to wrap
@returns {Functions} The wrapped function, which when invoked, will retry on
an error, based on the parameters specified in `opts`.
@example

async.auto({
    dep1: async.retryable(3, getFromFlakyService),
    process: ["dep1", async.retryable(3, function (results, cb) {
        maybeProcessData(results.dep1, cb);
    })]
}, callback);