Grunt Contrib JSHint Warnings

Question

So in our build, we use jshint to warn us of any console log errors and any other anomalies. Currently, I'm unable to build (without --force) whenever I'm using the bitwise ~ operator. I am getting the following error in verbose:

>> Line 310: Unexpected '~'.
>> totalImpressions += ~~(data[i].impressions);

I added the

/*jshint bitwise:false */

flag in the top of the config file, but to no avail.

I also tried adding an ignore_warnings object like so:

/* global module */
/* Created by frank on 3/4/14. */
/*jshint bitwise:false */
module.exports = {
    options: {
        jshintrc: '.jshintrc',
        ignores: [],
        ignore_warning: {
            options: {
                '-W018': true,
                '-W052': true
            },
            src: ['**/*.js']
        }
    },
    all: []
}

But I have emptied out the strings in ignores and all for privacy... If anyone knows how to supress this error, I would greatly appreciate the help.