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GrowthBook Users

I suggest using the ready event to update the attributes within GrowthBook. <https://segment.com/docs/connections/sources/catalog/libraries/website/javascript/#ready>

something like:
```analytics.ready(function() {
  growthbook.setAttributes({
    ...growthbook.getAttributes(),
    id: analytics.user().anonymousId();
  });
});```

Fantastic, will give this a go. Thanks Graham!