up-show-for and up-hide-for attributes
can now be inserted dynamically after its controlling [up-switch] field has been
compiled.
    
      If you're upgrading from an older Unpoly version you should load unpoly-migrate.js
      to polyfill deprecated APIs.
    
    
      Changes handled by unpoly-migrate.js are not considered breaking changes.
    
  
See our upgrading guide for details.