In D8552#133369, @durin42 wrote:

This is stalled. I've got some bugs in the logic I can't track down and
this is second on my priority list at work. I do intend to come back to it,
but it'd be fair to mark it all as changes requested.

The interesting part is that although we are still taking wlock to write store
caches at many places, but still the test pases.

In D9007#135103, @marmoute wrote:

(maybe update the description to state this since this is a common question)

In D9008#135106, @marmoute wrote:

looks good. As an unrelated change, maybe add a comment on the previous block to indicate it is relevant for all python starting from 3.9+

In D9008#135000, @pulkit wrote:

Does this also works with python > 3.7 or we need to add a conditional here?

Since you both ask basically the same question...

Abandoning this in favor of D9007.

In D8930#134064, @marmoute wrote:

The ability to re-run the merge seems quite important and I fear the BC implication.