According to documentation of Swift's new object versioning middleware [1], a deleted object won't be visible but previous version content is still recoverable.

Documentation doesn't say how, though. After deleting myobject, I can see its versions:

$ openstack object delete testcontainer myobject
$ curl http://192.168.1.200:8080/v1/$ACCOUNT/testcontainer?versions -H "x-auth-token: $T" | python -m json.tool | grep -e version_id -e name
        "name": "myobject",
        "version_id": "1590896642.07497"
        "name": "myobject",
        "version_id": "1590892906.83929"
        "name": "myobject",
        "version_id": "1590892899.36921"

But I can't GET old versions of myobject:

$ curl -i http://192.168.1.200:8080/v1/$ACCOUNT/testcontainer/myobject?version-id="1590896642.07497"  -H "x-auth-token: $T"
HTTP/1.1 404 Not Found

After creating another object with the same name myobject, old versions are accessible again. This is a solution, but dare I say not a very elegant one. Can a deleted, versioned object be recovered without creating a dummy object with the same name?

[1] https://docs.openstack.org/swift/latest/middleware.html#object-crud-operations-to-a-versioned-container