Multiple questions about Recently Deleted, Archive, Item History, and Saved Form Details

I usually try to make my subject titles more specific to a question, but that would be difficult to do given the range of topics and questions, so my apologies.

I just upgraded to 7.8.6. I think I was last on 7.7 so there are tons of new features.

1) I see items in my Recently Deleted that go back around a year. How long are items kept in there? Is there a timeframe, or is there a certain count that will be retained and older ones removed? I see when I delete an item, I get a non-specific message that it can be recovered for a limited time.

2) Were trashed items being saved at the 1Password web site all along? (It wouldn't bother me if they had been. In fact I think it's good.)

3) Were items that might have been sitting around in an unemptied Trash folder also converted to Recently Deleted? I don't know if I had any in there at the time I upgraded.

4) Since previously one could leave the Trash unemptied indefinitely, making it into a home-spun archive, if you did convert those into Recently Deleted with a limit on how long they are retained there, it could conceivably lead to a surprise.

5) Is there a way to directly archive items from Recently Deleted? In the long run, people would probably use Archive rather than Delete if they wanted to save things. So what I'm asking about would be kind of a transitional thing - I'd never have trashed anything if I could have archived it, so I'd like to move my deleted items into the Archive while they are still available. It looks like I'd need to Restore something in order to then Archive it.

6) Item history vs. Saved Form Details

There's always been and still is a Saved Form Details in items, which seems to retain older versions of -- virtually all changes to fields? How does that relate to the item versions on the web site? Perhaps the idea for the Saved Details is to be able to manually view and copy/paste older values of individual fields, without having to completely revert to an older version of an item.

7) If you restore an older version of an item from the Item History, is the version it replaces saved anywhere? (It seems it would become the most recent item in the history.) And do the field values from the version you are replacing end up in the Saved Form Details of the restored item? (That can probably lead to all kinds of confusion!)

8) How long are previous versions of items kept? Indefinitely?

I know I'm going to get great answers, and I hope I remember all my questions and all your answers!

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1Password Version: 7.8.6
Extension Version: 7.6
OS Version: Catalina
Sync Type: 1Password