Re: What's cooking in git.git (Mar 2025, #02; Thu, 6)

> [Cooking]
> * ps/refname-avail-check-optim (2025-03-06) 16 commits
>  - refs: reuse iterators when determining refname availability
>  - refs/iterator: implement seeking for files iterators
>  - refs/iterator: implement seeking for packed-ref iterators
>  - refs/iterator: implement seeking for ref-cache iterators
>  - refs/iterator: implement seeking for reftable iterators
>  - refs/iterator: implement seeking for merged iterators
>  - refs/iterator: provide infrastructure to re-seek iterators
>  - refs/iterator: separate lifecycle from iteration
>  - refs: stop re-verifying common prefixes for availability
>  - refs/files: batch refname availability checks for initial transactions
>  - refs/files: batch refname availability checks for normal transactions
>  - refs/reftable: batch refname availability checks
>  - refs: introduce function to batch refname availability checks
>  - builtin/update-ref: skip ambiguity checks when parsing object IDs
>  - object-name: allow skipping ambiguity checks in `get_oid()` family
>  - object-name: introduce `repo_get_oid_with_flags()`
>  (this branch is used by kn/non-transactional-batch-updates.)
> 
>  The code paths to check whether a refname X is available (by seeing
>  if another ref X/Y exists, etc.) have been optimized.
> 
>  Needs review.
>  source: <20250306-pks-update-ref-optimization-v5-0-dcb2ee037e97@pks.im>