Undocumented edge case for adding background knowledge

Summary

Adding two items with the same absolute path succeeds if some other property is distinct.

Steps to reproduce

Send a POST request to /bg requesting to add two items with identical path but at least one distinct property.

Example cURL call:

curl --request POST 'http://localhost:4444/bg' \
--header 'Content-Type: application/json' \
--data-raw '[{
        "type" : "directory",
        "abs_path": "/A/B",
        "creation_time": 1
  },
  {
        "type" : "directory",
        "abs_path": "/A/B",
        "creation_time": 2
  }
]'

Observed behavior

The server returns that both items have been added.

{
    "added": 2,
    "received": 2,
    "skipped": 0
}

Expected behavior

Only the first addition should succeed. The second should fail as there is already an item known at this path.