nervgh/angular-file-upload queueLimit greater than 10

I used angular-file-upload directive for uploading my images. 

.value('fileUploaderOptions', {
    url: '/',
    alias: 'file',
    headers: {},
    queue: [],
    progress: 0,
    autoUpload: false,
    removeAfterUpload: false,
    method: 'POST',
    filters: [],
    formData: [],
    queueLimit: 20,
    withCredentials: false
})

I want to set the queueLimit.

queueLimit: 5 works.

queueLimit: 20 -> max. queue length = 10.

Why?

Does the directive have min and max integers for parameter queueLimit? Actually I want no queue limit, so that the user can upload unfinitely many images.

note that queueLimit in the 'fileUploaderOptions' should be equal to Number.MAX_VALUE:

.value('fileUploaderOptions', {
        url: '/',
        alias: 'file',
        headers: {},
        queue: [],
        progress: 0,
        autoUpload: false,
        removeAfterUpload: false,
        method: 'POST',
        filters: [],
        formData: [],
        queueLimit: Number.MAX_VALUE,
        withCredentials: false
    })

in order to set the limit of the queue, use uploder.filters. example:

    uploader.filters.push({
        name: 'customFilter',
        fn: function(item , options) {
            return this.queue.length < 15; //set the queue length max value
        }
    });

Actually I want no queue limit, so that the user can upload unfinitely many images. set the function to return true always : 

fn: function(item , options) {
                return true; 
            }

This solution worked with me

in controller

var uploader = new FileUploader({ queueLimit: 1 });

then in the view.

< element nv-file-drop filters="queueLimit">