“Enable AIP 91 - compatibility checker v2 and enum types” You can vote here: Enable AIP 91 - compatibility checker v2 and enum types - Aptos Proposal
Move-2 introduces exciting new features to the Move language on Aptos, including Enum types (also known as ADTs).
This feature allows developers to define different variants for a value and match them at runtime. AIP 91 outlines the changes in the Move VM enabling this.
Impact: This extension to the Move VM significantly enhances code quality. While the first version introduces the essential features, more updates will be needed in the future to further improve performance.