From 7896b80c42581b9d26a9af0e991f8b5049fbd5d4 Mon Sep 17 00:00:00 2001
From: daviddoji <daviddoji@pm.me>
Date: Fri, 24 May 2024 14:44:43 +0200
Subject: [PATCH] Add change 29 to instructions

---
 how_to/Change_29.md | 9 +++++++++
 1 file changed, 9 insertions(+)
 create mode 100644 how_to/Change_29.md

diff --git a/how_to/Change_29.md b/how_to/Change_29.md
new file mode 100644
index 0000000..e2812d5
--- /dev/null
+++ b/how_to/Change_29.md
@@ -0,0 +1,9 @@
+- log: Use `iter_commits_and_parents`
+
+Refactoring ahead! Since we have `iter_commits_and_parents` from `k`, let's also
+use this function in `log`. We'll need to adjust it a bit to use
+`collections.deque` instead of a set so that the order of commits is deterministic.
+
+This generalization might seem unneeded at this point, but it will be useful
+later. (Note for the advanced folks: When we implement merge commits that have
+multiple parents, this generic way to iterate will come in handy.)