docs: function checkAndAssignWaitTime(method, options, name, that) {
          var n;
          n = options[name];
          if ('undefined' !== typeof n) {
              name = name + 'WaitTime';
              n = options[name];
          }
          if ('undefined' !== typeof n) {
              if ('number' !== typeof n || n < 0) {
                  throw new TypeError('PushManager.' + method + ': options.' +
                                      name + 'must be a positive number. ' +
                                      'Found: ' + n);
              }
              that[name] = n;
              return n;
          }
      }