On Wed, May 20, 2020 at 7:20 PM Han-Wen Nienhuys [off-list ref] wrote:

Jonathan Nieder said that this is used for git-stash, but I have never
understood why this is necessary, and would love to clarify this
better.

The doc says this:

"The `log_type = 0x0` is mostly useful for `git stash drop`, removing an
entry from the reflog of `refs/stash` in a transaction file (below),
without needing to rewrite larger files. Readers reading a stack of
reflogs must treat this as a deletion."

I should probably look at the code for git-stash to see how this plays out.

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Han-Wen Nienhuys - Google Munich
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