Re: [PATCH v3 0/5] Skip 'cache_tree_update()' when 'prime_cache_tree()' is called immediate after

> Changes since V2
> ================
>
>  * Cleaned up option handling & provided more informative error messages in
>    'test-tool cache-tree'. The changes don't affect any behavior in the
>    added tests & 'test-tool cache-tree' won't be used outside of
>    development, but the improvements here will help future readers avoid
>    propagating error-prone implementations.
>    * Note that the suggestion to change the "unknown subcommand" error to a
>      'usage()' error was not taken, as it would be somewhat cumbersome to
>      use a formatted string with it. This is in line with other custom
>      subcommand parsing in Git, such as in 'fsmonitor--daemon.c'.