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						- 'use strict'
 - 
 - /* eslint-disable no-var */
 - 
 - var queue = require('./')(worker, 1)
 - 
 - queue.push(42, function (err, result) {
 -   if (err) { throw err }
 -   console.log('the result is', result)
 - })
 - 
 - function worker (arg, cb) {
 -   cb(null, 42 * 2)
 - }
 
 
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