* 🐛 Fix token sets selection representation in exported theme
* 🐛 Fix the loss of token set order
* 🐛 Change data shape according to internal representaion
* 🐛 Persist sets order on import according to metadata
* 🐛 Add fallback for nil values
* 🐛 Fix test assertions accoding to the exported json format
* 🐛 Make `:is-source` optional
* ♻️ Fix test description
* ♻️ Remove outdated comment
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