Eric Sunshine [off-list ref] writes:

quoted

+       l=$(printf file | git hash-object -t blob -w --stdin) &&
+       echo "120000 $l symlink" |
+       git update-index --index-info &&

As mentioned[1] in the review of v1, this should be written:

    echo "120000 $l symlink" | git update-index --index-info &&

[1]: https://lore.kernel.org/git/xmqqftgff1r0.fsf@gitster-ct.c.googlers.com/ (local)

quoted

+       git commit -m master &&
+       git checkout b-symlink &&
+       l=$(printf file-different | git hash-object -t blob -w --stdin) &&
+       echo "120000 $l symlink" |
+       git update-index --index-info &&

Same here.  Funnily, 2/3 improves on this, but I agree that we
should get it right from the get-go.

quoted

+       git commit -m b-symlink &&
+       git checkout b-file &&
+       echo plain-file >symlink &&
+       git add symlink &&
+       git commit -m b-file
+'