fix: optimize variant cache access, legacy exposure

[bgiori]

Summary

• Call get() for accessing the variant rather than getAll()[key]
• Check if there is a legacy exposure tracker before adding context to the user

Checklist

• Does your PR title have the correct title format?
• Does your PR have a breaking change?: No

[paladin8]

Thanks for the quick fix! I assume we'll release a new version and then upgrade the client used in our app?

[bgiori]

Thanks for the quick fix! I assume we'll release a new version and then upgrade the client used in our app?

Yep, thanks for the review, and thanks again for finding this.