List Manipulation w/ Cursor

[bstopp]

Does a subsequent list operation with a cursor reference keep track of intermediate operations on the original list's references?

For example:

1. i have 1000 items in a bucket
2. i list() with a limit of 100 - truncated list w/ cursor returned
3. Of the returned objects, I delete every 10th key, 10 total deletions

When i next run the list() passing the original cursor, will it pick up at the correct item from the original list, will it shift due to the deletions, or is is non-deterministic?

Intuitively i would expect either a shift or non-deterministic behavior as I've manipulated the list. Testing with Miniflare indicates that it is smart and keeps the correct position in the list. However, I'm not sure if that result of Miniflare is expected behavior in R2 or it's some side-effect of how Miniflare manages the content in memory.

What's interesting, and prompted this question: If i manipulate the underlying results of the list operation, via a put/copy operation, this has a different result: If i copy an item to a location that is later in the order, and after the cursor position, the list operation seems to reset to the beginning - even if i pass the cursor.