Status for polyfilling IE / Edge?

Hi! Thanks for an extreemely valuable polyfill!

I was wondering about the status of using this shim to polyfill the lack of compound- and multiEntry indexes in IE and Edge. I used to create a polyfill for that for many years ago, but my work stalled so I''ve never picked it up. Is anything of this supported, and is there any idea or plan to include that in this polyfill? Would it be better to have a separate polyfill for IE/Edge?

Review the current IndexedDBShim support for compound and multiEntry indexes, focusing on how IE and Edge limitations are handled. Determine whether the requested support belongs in this polyfill or a separate one; done means documenting a decided scope and implementation plan.

Written by the indexing model from the issue text.