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      case 5:
        k1 = x64Xor(k1, x64LeftShift([0, key.charCodeAt(i + 4)], 32))
      // fallthrough
      case 4:
        k1 = x64Xor(k1, x64LeftShift([0, key.charCodeAt(i + 3)], 24))
      // fallthrough
      case 3:
        k1 = x64Xor(k1, x64LeftShift([0, key.charCodeAt(i + 2)], 16))
      // fallthrough
      case 2:
        k1 = x64Xor(k1, x64LeftShift([0, key.charCodeAt(i + 1)], 8))
      // fallthrough
      case 1:
        k1 = x64Xor(k1, [0, key.charCodeAt(i)])
        k1 = x64Multiply(k1, c1)
        k1 = x64Rotl(k1, 31)
        k1 = x64Multiply(k1, c2)
        h1 = x64Xor(h1, k1)
      // fallthrough
    }
    h1 = x64Xor(h1, [0, key.length])
    h2 = x64Xor(h2, [0, key.length])
    h1 = x64Add(h1, h2)
    h2 = x64Add(h2, h1)
    h1 = x64Fmix(h1)
    h2 = x64Fmix(h2)
    h1 = x64Add(h1, h2)
    h2 = x64Add(h2, h1)
    return ('00000000' + (h1[0] >>> 0).toString(16)).slice(-8) + ('00000000' + (h1[1] >>> 0).toString(16)).slice(-8) + ('00000000' + (h2[0] >>> 0).toString(16)).slice(-8) + ('00000000' + (h2[1] >>> 0).toString(16)).slice(-8)
  }

  var defaultOptions = {
    preprocessor: null,
    audio: {
      timeout: 1000,
      // On iOS 11, audio context can only be used in response to user interaction.
      // We require users to explicitly enable audio fingerprinting on iOS 11.
      // See https://stackoverflow.com/questions/46363048/onaudioprocess-not-called-on-ios11#46534088
      excludeIOS11: true
    },
    fonts: {
      swfContainerId: 'fingerprintjs2',
      swfPath: 'flash/compiled/FontList.swf',
      userDefinedFonts: [],
      extendedJsFonts: false
    },
    screen: {
      // To ensure consistent fingerprints when users rotate their mobile devices
      detectScreenOrientation: true
    },
    plugins: {
      sortPluginsFor: [/palemoon/i],
      excludeIE: false
    },
    extraComponents: [],
    excludes: {
      // Unreliable on Windows, see https://github.com/fingerprintjs/fingerprintjs/issues/375
      'enumerateDevices': true,
      // devicePixelRatio depends on browser zoom, and it's impossible to detect browser zoom
      'pixelRatio': true,
      // DNT depends on incognito mode for some browsers (Chrome) and it's impossible to detect incognito mode
      'doNotTrack': true,
      // uses js fonts already
      'fontsFlash': true,
      // Extensions (including AdBlock) are disabled by default in Incognito mod of Chrome and Firefox
      // See https://github.com/fingerprintjs/fingerprintjs/issues/405
      'adBlock': true
    },
    NOT_AVAILABLE: 'not available',
    ERROR: 'error',
    EXCLUDED: 'excluded'
  }

  var each = function (obj, iterator) {
    if (Array.prototype.forEach && obj.forEach === Array.prototype.forEach) {
      obj.forEach(iterator)
    } else if (obj.length === +obj.length) {
      for (var i = 0, l = obj.length; i < l; i++) {
        iterator(obj[i], i, obj)
      }
    } else {
      for (var key in obj) {
        if (obj.hasOwnProperty(key)) {
          iterator(obj[key], key, obj)
        }
      }
    }
  }

  var map = function (obj, iterator) {
    var results = []
    // Not using strict equality so that this acts as a
    // shortcut to checking for `null` and `undefined`.
    if (obj == null) {
      return results
    }
    if (Array.prototype.map && obj.map === Array.prototype.map) { return obj.map(iterator) }
    each(obj, function (value, index, list) {
      results.push(iterator(value, index, list))
    })
    return results
  }

  var extendSoft = function (target, source) {
    if (source == null) { return target }
    var value
    var key
    for (key in source) {
      value = source[key]
      if (value != null && !(Object.prototype.hasOwnProperty.call(target, key))) {
        target[key] = value
      }
    }
    return target
  }

  // https://developer.mozilla.org/en-US/docs/Web/API/MediaDevices/enumerateDevices
  var enumerateDevicesKey = function (done, options) {
    if (!isEnumerateDevicesSupported()) {
      return done(options.NOT_AVAILABLE)
    }