The backward compatibility is kept even with store v2, so there is no problem as it is.
Store.js version 2 is a full revamp with pluggable storage (it will automatically fall back to one that works in every scenario by default), pluggable extra functionality (like expirations, default values, common array/object operations, etc), and fully cross-browser automatic testing using saucelabs.com.
The backward compatibility is kept even with store v2, so there is no problem as it is.
cite: https://github.com/marcuswestin/store.js/tree/v2.0.4#user-content-version-20
Future expansion becomes easy.